- An electron-deficient tris(triazole)-based discotic liquid crystal that exhibits fast electron transport
-
In this study, a C3-symmetric star-shaped discotic mesogen has been reported based on an electron-deficient tris(triazole) central rigid core functionalized with three peripheral trialkoxyphenyl units. The mesogen exhibits an enantiotropic columnar hexagonal (Colh) phase that can sustain over a significant temperature range. When used in space-charge limited current (SCLC) devices, it showed ambipolar charge transport behavior with high electron mobility (μe) of 1.61 × 10-2 cm2 V-1 s-1 at ambient temperature. The finding is sufficiently significant to warrant their use in organic electronic devices.
- Bala, Indu,De, Joydip,Dhingra, Shallu,Gupta, Santosh Prasad,Pal, Santanu Kumar,Pandey, Upendra Kumar
-
-
Read Online
- Selective reduction of one, two, or three nitro groups in 1,3,5-trinitrobenzene with hydrazine hydrate
-
A method was developed for successive selective reduction of one, two, or three nitro groups in 1,3,5-trinitrobenzene with hydrazine hydrate in the presence of iron chloride and charcoal. This method provides an approach to the one-pot synthesis of 3,5-dinitroaniline, 1,3-diamino-5-nitrobenzene, or 1,3,5-triaminobenzene from 1,3,5-trinitrobenzene. Springer Science+Business Media, Inc. 2006.
- Shakhnes,Vorob'Ev,Shevelev
-
-
Read Online
- The composition of transformation products of 2,4,6-trinitrobenzoic acid in the aqueous-phase hydrogenation over Pd/C catalysts
-
Due to a detailed analysis of NMR spectra of the reaction solutions with different composition obtained by the aqueous-phase catalytic (Pd/C) hydrogenation of 2,4,6-trinitrobenzoic acid, the intermediate compounds were identified and a more substantiated mechanism was proposed for the formation of the main reaction products—1,3,5-triaminobenzene and cyclohexane-1,3,5-trione trioxime. The condensation of the 1,3,5-triaminobenzene molecules produced by a complete hydrogenation of 2,4,6-trinitrobenzoic acid was shown to result in the formation of a paramagnetic heterocyclic compound.
- Talsi, Valentin P.,Belskaya, Olga B.,Yurpalov, Vyacheslav L.
-
-
Read Online
- Transformation pathways of 2,4,6-trinitrobenzoic acid in the aqueous-phase hydrogenation over Pd/C catalyst
-
Results of the catalytic hydrogenation of 2,4,6-trinitrobenzoic acid (TNBA) in the presence of 1% Pd/C catalyst with analysis of the reaction products at the steps corresponding to the consumption of 1, 3, 5, 6, 8 and 9 mols of hydrogen per mol of TNBA are presented. Numerous reaction intermediates were identified using the 1H and 13C NMR spectroscopy; the reaction mixture composition was assessed quantitatively at different steps of the hydrogenation. The data obtained were used to propose a scheme of TNBA transformations over the Pd/C catalyst in the aqueous-phase reaction conditions. The data on the component composition at different steps of TNBA hydrogenation are important to understand the process chemistry, to explore the possibility of selective formation of different types of intermediate nitroamino compounds, and to synthesize high-performance catalysts for the hydrogenation of aromatic polynitro compounds.
- Belskaya, Olga B.,Talsi, Valentin P.,Mironenko, Roman M.,Rodionov, Vladimir A.,Sysolyatin, Sergey V.,Likholobov, Vladimir A.
-
-
Read Online
- Effect of the reduction conditions of the supported palladium precursor on the activity of Pd/C catalysts in hydrogenation of sodium 2,4,6-trinitrobenzoate
-
The study addresses the effect of the reduction conditions of palladium polynuclear hydroxo complexes (PHC) supported on the Sibunit carbon material on the dispersion of the metal particles and the activity of 0.5%Pd/Sibunit catalysts in the selective hyd
- Belskaya,Mironenko,Gulyaeva,Trenikhin,Likholobov
-
-
Read Online
- Dynamic self-assembled polymer: HCl responsive inversion of supramolecular polymer handedness
-
A series of discotic tricarboxyamides with varied amino acid side arm functionality and their HCl responsive diverse self-assembly behavior and formation of dynamic polymer is studied. Discotic trisamide 1 obtained from Boc protected l-Lys self-assembled into a long fibrillar aggregate-like supramolecular P helical polymer. However, on addition of HCl, the supramolecular helical handedness of the assemblies is completely inverted. Irrespective of the chiral centres configuration, supramolecular chiral bias is arising from molecular conformations. FE-SEM reveals the formation of right handed entangled polymeric fibers. However, left handed entangled fibers have appeared on addition of 0.12 M HCl. The trisamide 2 containing Boc protected l-Trp exhibits disk like morphology both in the presence and absence of 0.12 M HCl and does not show a change of supramolecular handedness. This demonstrates how remarkably distinct morphologies originate from stimuli responsive building blocks assembled in a subtly different manner.
- Paikar, Arpita,Haldar, Debasish
-
-
Read Online
- An unusual reduction route of 2,4,6-trinitrobenzoic acid under conditions of aqueous-phase hydrogenation over Pd/Sibunit catalyst
-
For the first time it was established that the catalytic hydrogenation of 2,4,6-trinitrobenzoic acid to 1,3,5-triaminobenzene can proceed via the formation of aromatic hydroxyamines and cyclohexane-1,3,5-trione trioxime. As a result of aqueous-phase hydrogenation of sodium salt of 2,4,6-trinitrobenzoic acid in the presence of 5%Pd/Sibunit catalyst at a temperature of 323 K and pressure of 0.5 MPa, a trioxime in high yield (about 70 %) was obtained. Due to high selectivity to cyclohexane-1,3,5-trione trioxime the catalytic hydrogenation of sodium salt of 2,4,6-trinitrobenzoic acid can be considered as a new method for its synthesis.
- Mironenko,Belskaya,Talzi,Rodionov,Sysolyatin,Likholobov
-
-
Read Online
- Synthesis and Two-Dimensional Chiral Surface Self-Assembly of a π-Conjugated System with Three-Fold Symmetry: Benzotri(7-Azaindole)
-
The synthesis of a novel expanded π-conjugated system, namely benzotri(7-azaindole), BTAI, is reported. Its C3h symmetry along with the integration of six complementary donor and acceptor N?H???N hydrogen bonds in the conjugated structure promote the 2D self-assembly on Au(111) over extended areas. Besides, a perfect commensurability with the gold lattice endows the physisorbed molecular film with a remarkable stability. The structural features of BTAI result in two levels of surface chirality: Firstly, the molecules become chiral upon adsorption on the surface. Then, due to the favorable N?H???N hydrogen bond-directed self-assembly, along with the relative molecular rotation with respect to the substrate, supramolecular chirality manifests in two mirror enantiomorphous domains. Thus, the system undergoes spontaneous chiral resolution. LEED and STM assisted by theoretical simulations have been employed to characterize in detail these novel 2D conglomerates with relevant chiral properties for systems with C3h symmetry.
- Rodríguez, Luis M.,Gómez, Paula,Más-Montoya, Miriam,Abad, José,Tárraga, Alberto,Cerdá, Jorge I.,Méndez, Javier,Curiel, David
-
-
Read Online
- Gold nanoparticles-supported histamine-grafted monolithic capillaries as efficient microreactors for flow-through reduction of nitro-containing compounds
-
A histamine functionalized monolith was synthesized within a micro-sized channel as a permeable support for the immobilization of 5, 20 and 100 nm-sized gold nanoparticles and the resulting nanostructured hybrid monoliths were applied as microreactors for the catalytic reduction of nitro-derivatives. The whole synthetic pathway of the composite materials relies on (i) UV-induced polymerization of N-acryloxysuccinimide and ethylene glycol dimethacrylate in toluene, (ii) surface grafting of histamine through nucleophilic substitution of hydroxysuccinimide leaving groups, and (iii) specific adsorption of citrate-stabilized colloidal gold nanoparticles. The achievement of the successive synthetic steps was ascertained by using a combination of experimental techniques providing information about the chemical composition (FTIR, Raman, and EDX) and porosity and surface-dispersion (SEM) of gold nanoparticles. Of particular interest, it is shown that surface-grafted histamine units exhibit strong affinity towards gold nanoparticles and allow homogeneous and dense dispersion of 5 and 20 nm sized nanoparticles. Consequently, the gold nanoparticle size-dependence of the catalytic activity (conversion of nitro and di-nitro aromatic compounds into the corresponding amino and di-amino-derivatives) was demonstrated, highlighting the utmost importance of controlling the dispersion of nano-catalysts on the support surface, while histamine protonation was also evidenced as a parameter of paramount importance regarding nanogold surface density and thus resulting catalytic activity. Histamine protonation notably allows the generation of electrostatic interactions between citrate-coated gold nanoparticles and thus-formed positive charges at the monolith surface.
- Liu,Guerrouache,Kebe,Carbonnier,Le Droumaguet
-
-
Read Online
- Synthesis of Azapolycyclic Systems Based on the Indolizino[3,4-b]quinoline Skeleton - A Diastereoselective Entry to Potential Oligodentate Artificial Receptors
-
A convenient diastereoselective synthetic route to the molecular tweezer bis(indolizino[3,4-b]quinolyl)methane 9 and the rigid indolizino[7′,8′:2,3]quinolino[8,7-h]indolizino[8,7-b]quinolines 14, 15 as potential receptor molecules has been developed, involving double imine condensation followed by Lewis acid catalyzed biscyclization of prolinal-derived bis-(imines) 8 and 13, respectively. Whereas the use of SnCl4 leads to the formation of the planar polycycle 15, the corresponding concave product 14 is formed in the presence of EtAlCl2. Both compounds 14, 15, as well as tweezer 9 have been characterized by X-ray crystal-structure analysis. Although tris(imines) 20, 24 derived from 1,3,5-triaminobenzene (18) and tris(4-aminophenyl)amine (23) could be obtained similarly by molecular sieve-catalyzed condensation, the corresponding triscyclization could not be achieved. However, by attaching preformed indolizino[3,4-b]quinoline subunits 25 and 31 to an aromatic core, the bidentate receptors 30, 33 and the tentacle molecule 28 were accessible.
- Temme, Oliver,Dickner, Tim,Laschat, Sabine,Froehlich, Roland,Kotila, Sirpa,Bergander, Klaus
-
-
Read Online
- Safe synthesis method of 1,3,5-triamino-2,4,6-trinitrobenzene
-
The invention provides a safe synthesis method of 1,3,5-triamino-2,4,6-trinitrobenzene, wherein the safe synthesis method comprises the steps: based on the isomerism characteristics of 1,3,5-cyclohexyltriketone imine and 1,3,5-triaminobenzene, taking 1,3,5-cyclohexyltriketone as a reaction raw material, and preparing N,N',N''-triacetyl-1,3,5-triaminobenzene through a trioximation reaction, an N-O bond cleavage-isomerism reaction and an N-acylation reaction; and taking N,N',N''-triacetyl-1,3,5-triaminobenzene as a raw material, and preparing TATB through a multi-stage one-pot tri-nitration reaction. The method has the significant characteristic of the multi-stage one-pot tri-nitration reaction, so that the amination step of an explosive multi-nitro-compound is avoided so as to substantially improve the safety, the used reactants or the used catalyst is the common product in the chemical industry, the use of a non-degradable organic solvent is avoided, the green and safe synthesis is achieved; and meanwhile, on the basis of the characteristics of a one-pot method, the operation process is simplified, operations such as separation, purification and collection of an intermediate product are avoided, and large-scale preparation of 1,3,5-triamino-2,4,6-trinitrobenzene is facilitated.
- -
-
Paragraph 0062; 0069-0073; 0089; 0093-0094; 0101; 0104; ...
(2021/06/23)
-
- Synthesis method of high-purity phloroglucinol compound
-
The invention discloses a one-step chemical catalytic synthesis method of high-purity phloroglucinol by taking 3,5-dichlorophenol as a starting material and taking strong base and a catalyst as auxiliary materials. Through the method, the phloroglucinol compound with high molar yield, high purity and low cost can be effectively synthesized.
- -
-
-
- COMPOUNDS, PHARMACEUTICAL COMPOSITIONS AND USE THEREOF AS INHIBITORS OF RAN GTPASE
-
Compounds of general formula IA, IB and IC outlined below, including pharmaceutically acceptable salts, solvates and hydrates thereof. Such compounds and pharmaceutical compositions comprising them may be used in medical conditions involving Ran GTPase.
- -
-
Paragraph 0099
(2019/04/09)
-
- Synthetic method for 1,3,5-triaminobenzene
-
The invention provides a synthetic method for 1,3,5-triaminobenzene. The method comprises the following steps: with phloroglucinol as shown in a structural formula IV which is described in the specification as a reaction raw material, subjecting the phloroglucinol and hydroxylamine hydrochloride to an oxime-forming reaction under an alkaline condition, and carrying out filtering and drying treatment so as to obtain 1,3,5-cyclohexanetrione oxime as shown in a structural formula III which is described in the specification; and subjecting the 1,3,5-cyclohexanetrione oxime to a hydrogenation reaction, and carrying out purification treatment so as to obtain 1,3,5-triaminobenzene as shown in a structural formula II which is described in the specification. According to the invention, a starting raw material used in the method is the phloroglucinol which is cheap and easily-available; an intermediate namely the 1,3,5-cyclohexanetrione oxime is non-explosive and facilitates separation and purification; and compared with a conventional method, the method provided by the invention has low cost and safe process. The method for preparation of the 1,3,5-triaminobenzene provided by the inventionadopts a hydrazine hydrate solution as a reducing reagent, does not need using strong acid and strong alkali, or catalytic hydrogenation under a normal pressure, and has the advantages of simple process, safety, low cost and environment friendliness.
- -
-
Paragraph 0098; 0099; 0112; 0123; 0134
(2018/09/13)
-
- For forming the functional polymer film of the coating liquid and functional polymer film forming method
-
Provided is a coating solution for forming a functional polymer film, said coating solution containing: at least one type of modifying compound selected from the group represented by formula A-D and having at least one Meldrum's acid structural site and a functional structural site which imparts functionality; and a polymer for modification or a monomer for the synthesis of said polymer for modification. Also provided is a functional polymer film obtained by firing a substrate coated using said coating. (In the formulae, the symbols are groups as defined in claim 1.)
- -
-
Paragraph 43; 44
(2017/10/28)
-
- Regioselective Radical Arylation of Aromatic Diamines with Arylhydrazines
-
The arylation of aromatic diamines with arylhydrazine hydrochlorides was achieved in reasonable yields. This new and simple reaction occurred at room temperature in air using an inexpensive base. This transformation seems to proceed via a homolytic aromatic substitution (HAS) mechanism. The synthesized aromatic diamines are used as raw materials for polyimides, including important aerospace materials, for example, Kapton
- Taniguchi, Toshihide,Imoto, Mitsutaka,Takeda, Motonori,Nakai, Takeo,Mihara, Masatoshi,Mizuno, Takumi,Nomoto, Akihiro,Ogawa, Akiya
-
p. 1623 - 1631
(2017/03/21)
-
- Synthesizing method of 2, 6 diamido-4-carboxyl benzenesulfonic acid
-
The invention discloses a synthesizing method of 2, 6 diamido-4-carboxyl benzenesulfonic acid, which belongs to the technical field of chemical synthesis. 2,6 diamido-4-carboxyl benzenesulfonic acid is prepared by taking benzene as a raw material, adding reaction liquid mixed by concentrated nitric acid and concentrated sulfuric acid, mixing, washing with a sodium hydroxide solution, reacting with stannous chloride, iron powder and acetic acid, dropwise adding nitric acid and mixing to obtain triaminobenzene, adding sulphurous acid, under the action of sodium percarbonate, dropwise adding the sodium hydroxide solution for reaction, adding concentrated sulfuric acid after suction filtration, accelerating the reaction under the catalyst tetrabromoethane, adding hydrochloric acid for reaction, washing, performing suction filtration and cooling to room temperature. The synthesizing method has the beneficial effects of simple synthesizing steps, low cost, less side products in the preparing process, and high purity (more than 99.2%) and high yield (more than 95%) of the obtained 2,6 diamido-4-carboxyl benzenesulfonic acid.
- -
-
Paragraph 0004; 0009
(2017/01/02)
-
- Design of a binuclear Ni(II)-iminodiacetic acid (IDA) complex for selective recognition and covalent labeling of His-tag fused proteins
-
Selective protein labeling with a small molecular probe is a versatile method for elucidating protein functions under live-cell conditions. In this Letter, we report the design of the binuclear Ni(II)-iminodiacetic acid (IDA) complex for selective recognition and covalent labeling of His-tag-fused proteins. We found that the Ni(II)-IDA complex 1-2Ni(II) binds to the His6-tag (HHHHHH) with a strong binding affinity (Kd = 24 nM), the value of which is 16-fold higher than the conventional Ni(II)-NTA complex (Kd = 390 nM). The strong binding affinity of the Ni(II)-IDA complex was successfully used in the covalent labeling and fluorescence bioimaging of a His-tag fused GPCR (G-protein coupled receptor) located on the surface of living cells.
- Takahira, Ikuko,Fuchida, Hirokazu,Tabata, Shigekazu,Shindo, Naoya,Uchinomiya, Shohei,Hamachi, Itaru,Ojida, Akio
-
supporting information
p. 2855 - 2858
(2014/06/10)
-
- Fluorescent markers and use thereof for labeling specific protein targets
-
Novel fluorescent markers of Formula I: are disclosed herein, wherein X and Y are independently or together absent or are independently selected from R and R1 are independently selected from H and alkyl; Ar is phenyl or heteroaryl; L is absent or a spacer selected from the group consisting of —NH—; —(CH2)nNH—; —NHSO2—; —(CH2)nNHCO—; -(cycloalkyl)NHCO—; —(CH2)nNHSO2—; -(cycloalkyl)NHSO2—; —CONH(CH2)nNHCO—; —CONH(cycloalkyl)NHCO—; —NHCO(CH2)nNHCO—; —NHCO(cycloalkyl)NHCO—; —(CH2)nSO2NH—; -(cycloalkyl)SO2NH—; —(CH2)nNHCSNH—; -(cycloalkyl)NHCSNH—; —CR═CR1—; —C≡C—; —(CH2)nN═CH—; -(cycloalkyl)N═CH—; —N═CH(CH2)—; —N═CH(cycloalkyl)-; n is an integer ranging from 1 to 5; F is a fluorophore selected from the group consisting of fluorescein, rhodamine, eosin, thionine, safranin, coumarin, methoxycoumarin, dansyl, BODIPY and BODIPY derivatives; and wherein X, Y and L may be positioned in a 1,3,5; 1,2,3; 1,3,4 or in a 3,4,5 configuration respectively.
- -
-
Page/Page column 21
(2014/09/29)
-
- Diamination of phenylene dihalides catalyzed by a dicopper complex
-
Diamination of phenylene dihalides with aqueous ammonia to give the corresponding phenylenediamines can be achieved by using a dicopper complex [Cu2(bpnp)(OH)(CF3COO)3] (1) (bpnp = 2,7-bis(pyridine-2-yl)-l,8-naphthyridine) as the catalyst in the presence of Bu4NBr and Cs2CO3 in high yields. In addition, 1,3,5-tribromobenzene was converted into benzenetriamine quantitatively under the same conditions. This method offers a new opportunity, particularly simplifying steps and increasing yields, for the preparation of aryl diamines.
- Liao, Bei-Sih,Liu, Shiuh-Tzung
-
experimental part
p. 6653 - 6656
(2012/10/07)
-
- Crystal structure of a highly efficient clarifying agent for isotactic polypropylene
-
Using a combined approach based on X-ray powder diffraction and solid-state NMR spectroscopy, we were able to determine the crystal structure of 1,3,5-tris(2,2-dimethylpropionylamino)benzene, an efficient clarifying agent for isotactic polypropylene. The XPRD data and 1D solid-state NMR experiments allowed to exclude most of the possible primitive orthorhombic space groups with the exception of 11. The structure solution was carried out using real space methods including a close-contact penalty. Four space groups lead to reasonable wRp values below 10%. 13C13C double quantum (DQ) experiments of the labeled carbonyl group were measured with a supercycled symmetry based dipolar recoupling sequence. Taking into account the wRp values after Rietveld refinement as well as simulations of DQ build-up curves based on nine spin systems, the space group P212121 is clearly favored. The largest dipolar coupling within these spin systems was about 60 Hz corresponding to a distance of 5 A. 1,3,5-Tris(2,2- dimethylpropionylamino)benzene crystallizes in an orthorhombic metric (a = 14.91(5) A, b = 24.05(8) A, c = 6.80(2) A). The molecules are arranged in a pseudohexagonal rod packing with medium-strong hydrogen bonds and π-stacking. The antiferroelectric arrangement of neighbored rods leads to an averaging of the net dipolar moment in the whole crystal.
- Schmidt, Marko,Wittmann, Johannes J.,Kress, Roman,Schneider, Denis,Steuernagel, Stefan,Schmidt, Hans-Werner,Senker, Juergen
-
experimental part
p. 2543 - 2551
(2012/08/14)
-
- Tris(triazolo)benzene and its derivatives: High-density energetic materials
-
High-performance explosives: Tris(triazolo)benzene was synthesized and converted to its trinitro and trichloro derivatives (see scheme; R=NO 2, Cl). The heats of formation of this "high-nitrogen" compounds were calculated and combined with experimentally determined densities to determine detonation pressures and velocities. They exhibit high density, good thermal stability, high heats of formation, and moderate to good detonation properties. Copyright
- Thottempudi, Venugopal,Forohor, Farhad,Parrish, Damon A.,Shreeve, Jean'Ne M.
-
supporting information
p. 9881 - 9885
(2012/11/07)
-
- Dramatic increase of quench efficiency in "spacerless" dimaleimide fluorogens
-
In this post-genomic era, new techniques are needed to cope with the task of assigning functional roles to the huge number of identified putative gene products. We have developed a minimalist labelling strategy based on the use of synthetic fluorogenic probe reagents that fluoresce only after their reaction with a target peptide sequence. The probe reagents have fluorescent cores and bear two maleimide groups, such that their latent fluorescence is quenched by a photoinduced electron transfer (PET) to the pendant maleimide groups, until both of these groups undergo a specific thiol addition reaction. The efficiency of the fluorescence quenching is critical to the practicality of this labelling method, and has been predicted to be related to the intramolecular distance between the fluorophore and the maleimide groups. We have conducted the first direct test of this hypothesis by preparing a series of novel fluorogens that differ only by the spacer moiety separating their coumarin fluorophore and their dimaleimide fragment. A striking correlation was observed between intramolecular distance and the fluorescence enhancement (FE) observed after reaction with two equivalents of thiol. Guided by this observation, we then designed 'spacerless' fluorogens, of which a dansyl derivative shows an FE ratio of >300, the largest recorded for dimaleimide fluorogens. The trends observed herein provide valuable lessons for subsequent fluorogen design, and the novel fluorogens developed in the course of this study are currently being applied to protein labelling applications.
- Caron, Karine,Lachapelle, Virginie,Keillor, Jeffrey W.
-
experimental part
p. 185 - 197
(2011/02/23)
-
- Synthesis of chiral cyclobutane containing C 3-symmetric peptide dendrimers
-
(Figure Presented) Five new highly functionalized cyclobutane containing C3-symmetric peptide dendrimers have been synthesized through a convergent approach from 1,3,5-trisubstituted benzene and chiral λ,ε-amino diacid derivatives as well as a λ-tetrapeptide. The first example of the synthesis of N-centered amides by using 1,3,5-triaminobenzene and a carboxylic acid is reported.
- Gutierrez-Abad, Raquel,Illa, Ona,Ortuno, Rosa M.
-
supporting information; experimental part
p. 3148 - 3151
(2010/08/20)
-
- MODIFIED POLYOLEFIN WAXES
-
Described is a method for modifying the thermal softening behaviour of a polyolefin wax, which comprises the incorporation into the wax of at least one compound of the formula (I) wherein Q is a C3-C12alkyltriyl, a tris(C1-C8alkylene)amine, a C3-C12cycloalkyltriyl or is of the formula (II), or X1, X2 and X3 are independently from each other -NH-CO-NH-, -NH-CO-O-, -O-CO-NH-, - NH-CO-, -CO-NH, -COO- or -0-; R1, R2 and R3 are various unsubstituted or substituted aliphatic or aromatic radicals.
- -
-
Page/Page column 37
(2010/08/05)
-
- Oligomers of gadolinium chelates, their applicationascontrast products in magnetic resonance imaging and their synthesis intermediates
-
The invention relates to high-relaxivity macrocyclic gadolinium chelate oligomers of formula [in-line-formulae]W-(A)m[/in-line-formulae] in which W, A and m are as defined in claim 1, and their use as a blood pool contrast product for magnetic resonance imaging.
- -
-
Page/Page column 43
(2010/11/26)
-
- ANION RECEPTOR, AND ELECTROLYTE USING THE SAME
-
Disclosed is a novel anion receptor and electrolytes containing the same. A novel anion receptor is an aromatic hydrocarbon compound having an amine substituted with electron withdrawing groups. When the anion receptor is added to the electrolyte, ionic conductivity and cation transference number of electrolytes are enhanced, thereby increasing the electrochemical stability of alkali metal batteries using the electrolytes.
- -
-
Page/Page column 28-29
(2008/06/13)
-
- Discotic liquid crystalline hydrazone compounds: Synthesis and mesomorphic properties
-
1,3,5-Trisacetoacetamidobenzene with three 1,3-diketo groups was synthesized by the reaction of 1,3,5-triaminobenzene with diketene. Discotic hydrazone compounds were prepared by the diazo coupling reaction between 1,3,5-trisacetoacetamidobenzene and diazonium salts of 4-alkyloxyphenylamines. The compounds existed in hydrazone forms exclusively, being stabilized by the intramolecular hydrogen bonds, and showed discotic nematic or columnar hexagonal mesophases.
- Jeong, Min Ju,Park, Jun Ha,Lee, Changjin,Chang, Ji Young
-
p. 2221 - 2224
(2007/10/03)
-
- Melamine purification process
-
A process for the purification of melamine, deriving from urea, according to a high pressure non catalytic process, by means of polycondensates and other by-products transformation, which by-products derive from the melamine synthesis comprosing the following steps: dissolving in water the raw liquid melamine containing polycondensates and other melamine synthesis by-products, subjecting such solution to a treatment capable to remove dissolved CO2limiting its concentration to a value lower than 0.5 wt. %, submitting raw melamine solution, to the action of ammonia, in an amount of 5 to 25 wt. %, at a temperature of 100 to 250° C. and leaving the mixture to react for some minutes, recoving a solution having polycondensates concentration lower than 1000 ppm, typically less than 100 ppm.
- -
-
Page column 4
(2008/06/13)
-
- Rational design of an enneanuclear copper(II) complex with a metallacyclophane core
-
A hexakis-bidentate building block: Tri-copper(II) and enneacopper(II) 1,3,5-metallacyclophanes were synthesized by a combination of self-assembly and a rational approach (see scheme). Both complexes exhibit ferromagnetic coupling in the core, through a spin-polarization mechanism.
- Ottenwaelder, Xavier,Cano, Joan,Journaux, Yves,Riviere, Eric,Brennan, Conor,Nierlich, Martine,Ruiz-Garcia, Rafael
-
p. 850 - 852
(2007/10/03)
-
- One step hair coloring compositions using salts
-
A hair coloring composition comprising the following two compositions which are mixed just prior to application to the hair: (a) a composition comprising a water-soluble peroxygen oxidizing agent; and (b) a composition comprising one or more oxidative hair coloring agents selected from the group consisting of an aromatic diamine, an amino phenol, a naphthol, a polyhydric phenol, a catechol and mixtures thereof; wherein the composition comprising one or more oxidative hair coloring agents further comprises al least one water soluble carbonate releasing salts; and optionally a water soluble ammonium salt, is described.
- -
-
-
- Transition metal complexes as dye forming catalysts in hair coloring compositions
-
A hair coloring composition comprising a first composition which comprises: (a) a dye forming transition metal salt or complex; which is first applied to the hair; and a second composition which comprises the following two compositions which are mixed just prior to application to the hair: (a) a composition comprising a water-soluble peroxygen oxidizing agent; and (b) a composition comprising one or more oxidative hair coloring agents selected from the group consisting of an aromatic diamine, an aminophenol, a polyhydric phenol a catechol and mixtures thereof.
- -
-
-
- Enhanced color deposition for hair with sequestering agents
-
Hair coloring compositions which comprise: (A) non-nitrogenous chelating agents from the group consisting of polyphosphate; phosphonates; hydroxycarboxylates; polyacrylates; zeolite; and mixtures thereof; (B) an oxidative dye primary intermediate; and (C) an oxidative dye coupler; (D) and water are described. The present invention also relates to a method for coloring hair which comprises contacting said hair with a hair coloring composition as described above.
- -
-
-
- Femtosecond optical switching of electron transport direction in branched donor-acceptor arrays
-
The branched donor-acceptor triad 4 and tetrad 5 were synthesized to study the possibility of controlling the direction of electron transfer in a divergent array of electron acceptors using ultrafast laser pulses. Compounds 4 and 5 employ 1,3,5-triaminobenzene as the central branch point. In 4, a4-(N-piperidinyl)-1,8-naphthaleneimide electron donor (ANI) was attached to the 1 position and two electron acceptors, 1,8:4,5-naphthalenediimide, NI, and pyromellitimide, PI, were attached to the 3 and 5 positions of the central benzene ring. In 5, the terminal end of the PI acceptor is functionalized with an additional NI molecule. Selective excitation of ANI in 4 and 5 with 400 nm, 130 fs laser pulses results in exclusive formation of NI--ANI+-PI and NI--ANI+-PI-NI, respectively, with τ = 115 ps, and a quantum yield of 0.99. Excitation of NI- with 480 nm, 130 fs laser pulses produces the excited doublet state *NI-, which transfers an electron to PI on the second branch of the benzene ring with a time constant of τ = 600 fs in 4 and τ = 750 fs in 5. The overall quantum yields for the two step process are 0.44 and 0.36 in 4 and 5, respectively. The resultant state NI-ANI+-PI- in 4 undergoes a charge shift reaction returning to the initial ion pair state NI--ANI+-PI with τ = 400 ps, while the corresponding state NI-ANI+-PI--NI in 5 undergoes a charge shift with τ = 200 ps to yield NI-ANI+-PI-NI-, which in turn exhibits a 2000 ps lifetime. These results show that once the electron has been switched to the branch containing the thermodynamically uphill PI acceptor, the electron will cascade down that branch to other acceptors that are more easily reduced. Model compounds 1-3, which were synthesized to aid in characterization of the switching dynamics, are also discussed. Photochemical control of directional charge transport may make it possible to design networks of organic molecules for information processing.
- Lukas, Aaron S.,Miller, Scott E.,Wasielewski, Michael R.
-
p. 931 - 940
(2007/10/03)
-
- Process for the preparation of peryleneimides, novel di-, tri- and tetrachromophoric perylene dyes and their use
-
Di-, tri- and tetrachromophoric perylene-3,4:9,10-tetracarboxylic acid imides of the formula I STR1 in which A is, for example, 1,4-phenylene, R is 1-hexylheptyl and m is 2, are readily accessible by reaction of a perylene-3,4:9,10-tetracarboxylic acid monoanhydride monoimide with 1,4-diaminobenzene-bisformamide. The preparation process and also a specific process for the preparation of monochromic perylene-3,4:9, 10-tetracarboxylic acid bisimides are also claimed. These processes are particularly suitable for reaction of highly electron-rich aromatic amines, which cannot be reacted under conventional condensation conditions. The compounds according to the invention are suitable, for example, as colouring agents for melt coloration of high molecular weight organic material, for use in security printing, as fluorescence dyes for machine-readable markings, as laser dyes and for the production of printing toners, colour filters, organic photoreceptors, electroluminescence and photoluminescence elements or solar collectors.
- -
-
-
- Bis-(maleamic acid) derivatives of triamines
-
The compositions described herein comprise polyimides having bis-maleimide terminal groups and having the formula: STR1 wherein Q is a trivalent aromatic radical, Ar is a divalent aromatic radical, Ar" is a tetravalent aromatic radical and n has a value of 0-20. Derivatives may be made of these compounds by homopolymerization, copolymerization with other copolymerizable materials and by reaction with Diels-Alder reactable materials.
- -
-
-
- Process for producing 1,3,5-triaminobenzene
-
An aminobenzene is produced by reacting a chlorobenzene with ammonia in the presence of a copper type catalyst, namely by reacting ammonia with 3,5-diaminochlorobenzene to produce 1,3,5-triaminobenzene at a temperature of 150° to 250° C. at a molar ratio of ammonia of 2 to 10 to 3,5-diaminochlorobenzene in the presence of a copper compound catalyst.
- -
-
-
- S-Phenenyltris(thioureylene)trinaphthalenetrisulfonic acid salts
-
s-Phenenyltris(thioureylene)trinaphthalenetrisulfonic acid salts useful as complement inhibitors.
- -
-
-
- 5-Phenenyltris (ureylene) triisophthalic acid salts
-
s-Phenenyltris(ureylene)triisophthalic acid salts useful as complement inhibitors.
- -
-
-
- Enzyme-activated oxidative process for coloring hair
-
An enzyme-based oxidative process for coloring hair wherein the hair is exposed to a solution having a pH of about 4 to about 10 and containing hydrogen peroxide, soybean peroxidase enzyme and one or more oxidation dye precursors.
- -
-
-
