- Exploring the C^N^C theme: Synthesis and biological properties of tridentate cyclometalated gold(III) complexes
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A family of cyclometalated Au(III) complexes featuring a tridentate C^N^C scaffold has been synthesized and characterized. Microwave assisted synthesis of the ligands has also been exploited and optimized. The biological properties of the thus formed comp
- Jürgens, Sophie,Scalcon, Valeria,Estrada-Ortiz, Natalia,Folda, Alessandra,Tonolo, Federica,Jandl, Christian,Browne, Duncan L.,Rigobello, Maria Pia,Kühn, Fritz E.,Casini, Angela
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Read Online
- Synthesis of a functionalized polymer based on a calix[4]resorcinarene via covalently anchored cationic moieties: A reactive solid support for ring transformation and expansion of thiopyrylium salts
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In this work, for the first time, a cationic polymer containing pendant pyridinium groups was synthesized via post-functionalization of the polymeric backbone based on a calix[4]resorcinarene, and characterized by AFM, TEM, analytical CHN, TGA, and DTG te
- Mouradzadegun, Arash,Elahi, Somayeh,Abadast, Fatemeh
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Read Online
- Silver(I) Complexes of Diphenylpyridines: Crystal Structures, Luminescence Studies, Theoretical Insights, and Biological Activities
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A series of simple two-coordinated cationic silver(I) complexes, namely, [Ag{4-(4-R1-phenyl)-2,6-diphenylpyridine}2]X (X=ClO4 ?, BF4 ?, or SO3CF3 ?), with different electron-donating or -withdrawing groups (e.g., R1=N(Me)2, Me, H, Cl, and Br) on the phenyl ring, were successfully prepared. Extensive characterization of these complexes by various NMR spectroscopy techniques and mass spectrometry was further corroborated by single-crystal XRD analyses. Detailed photophysical investigations of [Ag{4-(4-N,N-dimethylaminophenyl)-2,6-diphenylpyridine}2]ClO4 (C1) displayed a strong room-temperature fluorescence in solution with an anomalously high luminescence quantum yield of 0.83. The effects of distinct substituent groups (C2–C5), π-conjugated aromatic rings (C6 and C7), and anions (C8 and C9) on the photoluminescence properties were evaluated. Furthermore, DFT and time-dependent DFT calculations were performed to discern the composition of the excited state, as well as to confirm the obtained relative emission energies upon substitution with electronically different ligands. These results indicated that the strong electron-donating substituent of N,N-dimethylamine played an important role in the unprecedented high luminescence quantum yield of C1. In addition, preliminary antimicrobial studies and confocal microscopy fluorescent imaging of HeLa cells labeled with these complexes reveal their potential applications in biological activities.
- Wang, De-Hui,Zhang, Yuan,Wang, Yu-Tong,Feng, Hui-Yan,Chen, Yong,Zhao, De-Zhi
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Read Online
- An efficient synthesis of 2,4,6-triarylpyridines via solvent-free reaction between acetophenoneoximes and aldehydes
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An efficient synthesis of 2,4,6-triarylpyridines is described. Heating a mixture of an acetophenoneoxime and an aldehyde under solvent-free conditions afforded Kr?hnke pyridines in excellent yields. In this method acetophenoneoximes are directly used for the preparation of Kr?hnke pyridines under metal-free conditions. Georg Thieme Verlag Stuttgart New York.
- Mahernia, Shabnam,Mahdavi, Mohammad,Adib, Mehdi
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Read Online
- TMSOTf-mediated Kr?hnke pyridine synthesis using HMDS as the nitrogen source under microwave irradiation
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An efficient protocol for the preparation of pyridine skeletons has been successfully developed involving the TMSOTf/HMDS (trifluoromethanesulfonic acid/hexamethyldisilane) system for the intermolecular cyclization of chalcones under MW (microwave) irradiation conditions. This method provides a facile approach to synthesize 2,4,6-triaryl or 3-benzyl-2,4,6-triarylpyridines in good to excellent yields. Interestingly, the 2,6-diazabicyclo[2.2.2]oct-2-ene core was obtained by changing the acid additive to Sn(OTf)2, and the desired product was also confirmed using X-ray single-crystal diffraction analysis.
- Chan, Chieh-Kai,Chung, Yi-Hsiu,Wang, Cheng-Chung
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p. 8263 - 8273
(2022/04/07)
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- Application of salicylic acid as an eco-friendly and efficient catalyst for the synthesis of 2,4,6-triaryl pyridine, 2-amino-3-cyanopyridine, and polyhydroquinoline derivatives
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In this study, three eco-friendly, efficient, and convenient protocols have been reported for one-pot synthesis of 2,4,6-triaryl pyridine, 2-amino-3-cyanopyridine, and polyhydroquinoline derivatives using salicylic acid as a catalyst under solvent-free condition. The reported protocols offer several significant advantages such as the application of a nontoxic, neutral, and cheap catalyst, environmentally friendly conditions, the easy isolation of products by filtering, short reaction times, simple methodology, and good yields.
- Roozifar, Majid,Hazeri, Nourallah,Faroughi Niya, Homayoun
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p. 1117 - 1129
(2021/02/26)
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- D-π-A type tetraphenyl ethynylphenyl substituted pyridine conjugated luminous small molecule and synthesis method thereof
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The invention discloses D-π-A type tetraphenylethynylphenyl substituted pyridine conjugated luminous small molecule and a synthesis method thereof. 4 - Bromobenzaldehyde. The aryl acetophenone and ammonium acetate undergo Chichibabin reaction under the ca
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Paragraph 0057-0059; 0071
(2021/10/27)
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- Synthesis of Kr?hnke pyridines through iron-catalyzed oxidative condensation/double alkynylation/amination cascade strategy
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An efficient protocol for the synthesis of symmetrical and unsymmetrical 2,4,6-trisubstituted pyridines via oxidative cascade annulation of arylacetylenes with benzylamines has been developed. The reaction proceeds smoothly utilizing iron(II) triflate as a catalyst and molecular oxygen as an oxidant with broad substrate scope. Mechanistic studies reveal that the reaction may be experiences an oxidative condensation followed by double alkynylation and amination process.
- Gopalaiah, Kovuru,Choudhary, Renu
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supporting information
(2021/09/15)
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- Compound, electron transport material and organic electroluminescent device
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The present application provides a compound of general formula (I), which can be used in an electron transport material. The compound is high in bond energy among atoms, good in thermal stability, beneficial to solid-state accumulation among molecules, hi
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- Pyridine Skeleton Synthesis Using Acetonitrile as C4N1 Units and Solvent
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The first [3 + 2 + 1] methodology for pyridine skeleton synthesis via cascade carbopalladation/cyclization of acetonitrile, arylboronic acids, and aldehydes was developed. This reaction proceeds via six step tandem reaction sequences involving the carbopalladation reaction of acetonitrile, a nucleophilic addition, a condensation, an intramolecular Michael addition, cyclization, and aromatization. Delightfully, both palladium acetate and supported palladium nanoparticles catalyzed this reaction with similar catalytic performance. The characterization results of the fresh and used supported palladium nanoparticle catalysts indicated that the reaction might be performed via a Pd(0)/Pd(II) catalytic cycle that began with Pd(0). Furthermore, the products showed good fluorescence characteristics. The green homogeneous/heterogenous catalytic methodologies pave a new way for constructing the pyridine skeleton.
- Bai, Chaolumen,Guo, Huifang,Liu, Xin,Liu, Dan,Sun, Zhaorigetu,Bao, Agula,Baiyin, Menghe,Muschin, Tegshi,Bao, Yong-Sheng
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p. 12664 - 12675
(2021/09/18)
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- Design and application of (Fe3O4)-GOTfOH based AgNPs doped starch/PEG-poly (acrylic acid) nanocomposite as the magnetic nanocatalyst and the wound dress
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As a novel, recyclable nanocatalyst, (Fe3O4)-GOTfOH based Ag nanoparticles doped Starch/PEG-poly (acrylic acid) nanocomposite (Fe3O4?GOTfOH/Ag/St-PEG-AcA) was applied for one-pot synthesis
- Forouzandehdel, Shayan,Meskini, Maryam,Rami, Mina Rezghi
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- An efficient, green solvent-free protocol for the synthesis of 2,4,6-triarylpyridines using reusable heterogeneous activated Fuller’s earth catalyst
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Abstract: A simple, efficient, and green method of preparation for the synthesis of highly substituted pyridines by multicomponent reaction of acetophenones, aldehydes, and ammonium acetate using activated Fuller’s earth as an effective and reusable heterogeneous catalyst is described. The advantages of the present protocol include simple procedure with an easy workup procedure, mild reaction conditions, and high yields of the products. The performance of this reaction under solvent-free conditions using heterogeneous catalysts, such as activated Fuller’s earth, could enhance its efficiency from an economic as well as ecological point of view. Graphical abstract: [Figure not available: see fulltext.].
- Rekunge, Deelip S.,Kale, Ishwari A.,Chaturbhuj, Ganesh U.
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p. 2455 - 2462
(2018/09/13)
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- Aromatic ring-triarylpyridine compound as well as preparation method and application thereof
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The invention discloses a synthesis method of an aromatic ring-triarylpyridine compound. A triarylpyridine framework and arylboronic acid are taken as substrates, a series of aromatic ring-triarylpyridine compounds are synthesized under the synergistic ef
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Paragraph 0028; 0029; 0030; 0031; 0032; 0033
(2018/11/22)
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- One-Pot Synthesis of Benzene and Pyridine Derivatives via Copper-Catalyzed Coupling Reactions
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A highly efficient one-pot synthesis of polysubstituted pyridine has been achieved through copper-catalyzed oxidative sp3 C?H coupling of acetophenones with toluene derivatives. Besides, the polysubstituted benzene was obtained through copper-catalyzed coupling of acetophenones. Both of the reactions exhibited a good functional group tolerance to produce a 2,4,6-triphenylpyridine or 1,3,5-triarylbenzene in high yields. Compared with previous methods, these transformations allow a highly flexible and efficient preparation of substituted pyridines and benzenes. (Figure presented.).
- Han, Jianwei,Guo, Xin,Liu, Yafeng,Fu, Yajie,Yan, Rulong,Chen, Baohua
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supporting information
p. 2676 - 2681
(2017/08/16)
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- 2. 8 - diaryl (amino) toward ghale derivative synthetic method and its human liver HepG2 activity
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The invention discloses a synthesis method of 2,8-diaryl(amino) Troger's base derivatives, belonging to the synthesis method of the Troger's base derivatives. The 2,8-diaryl(amino) Troger's base derivatives comprise 2(8)-triarylpyridyl (tripyridyl) Troger's base (TB) derivative, 2,8-diaryl Troger's base (TB) derivative and 2-aryl-8-amino Troger's base (TB) derivative; the synthesis method adopts Suzuki reaction to respectively introduce triarylpyridyl, tripyridyl, phenyl, phenanthryl or anthryl fragment into the TB skeleton, and Ullmann reaction to introduce carbazole, diphenylamine or phenothiazine into the TB skeleton, to obtain the new 2,8-diaryl(amino) Troger's base (TB) derivatives. Four products with excellent human liver cancer HepG2 cell activity resistance are selected from all products with human liver cancer HepG2 cell activity resistance. The method introduces phenothiazine, carbazole and other fragments with physiological activities into the TB skeleton, to design and synthesize 2,8-diaryl(amino) Troger's base derivatives for the first time, so as to screen compounds with liver cancer activity resistance through the combination of both.
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Paragraph 0050; 0056-0057
(2017/11/16)
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- Synthesis of symmetrical pyridines by iron-catalyzed cyclization of ketoxime acetates and aldehydes
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A novel and facile iron-catalyzed cyclization of ketoxime acetates and aldehydes for the green synthesis of substituted pyridines has been developed. In the presence of a FeCl3 catalyst, this reaction exhibited a good functional group tolerance to produce 2,4,6-triarylsubstituted symmetrical pyridines in high yields in the absence of any additive. A gram-scale reaction sequence was performed to demonstrate the scaled-up applicability of this synthetic method.
- Yi, Yukun,Zhao, Mi-Na,Ren, Zhi-Hui,Wang, Yao-Yu,Guan, Zheng-Hui
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supporting information
p. 1023 - 1027
(2017/08/18)
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- Aromatic amine derivative, and preparation method and application thereof
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The invention provides an aromatic amine derivative, and a preparation method and application thereof, which relate to the technical field of organic optoelectronic materials. The aromatic amine derivative obtained through the invention can be used for preparing an organic light-emitting device, and is particularly used as a hole-transmission material in the organic light-emitting device, so that the light-emitting efficiency and the service life of an OLED (Organic Light Emitting Diode) device can be effectively improved, and are better than those of an existing common OLED device. The invention also provides the preparation method of the aromatic amine derivative. The preparation method is simple, and the raw materials are easy to get.
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Paragraph 0054; 0055; 0056; 0058; 0060; 0067
(2017/07/14)
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- Synthesis and photophysical properties of novel fluorescent materials containing 2,4,6-triphenylpyridine and 1,8-naphthalimide units using Suzuki reaction
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A series of novel 2,4,6-triphenylpyridine derivatives containing 1,8-naphthalimide groups have been prepared in good yields using Suzuki couplings reactions. The relationship of the photoluminescence property of the compounds was systematically investigated via a thermogravimetric analyzer, UV-vis, fluorescence and electrochemical analyzer.
- Liu, Hui-Yan,Chen, Liang-Feng,Wang, Hai-Ying,Wan, Yu,Wu, Hui
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p. 94833 - 94839
(2016/10/21)
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- Synthesis of Polyfunctional Pyridines via Copper-Catalyzed Oxidative Coupling Reactions
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An efficient and concise approach for the synthesis of polysubstituted pyridines has been achieved through copper-catalyzed oxidative sp3 C-H coupling of oxime acetates with toluene derivatives. Besides, benzylamine and p-toluenesulfonylhydrazo
- Fu, Yajie,Wang, Panpan,Guo, Xin,Wu, Ping,Meng, Xu,Chen, Baohua
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p. 11671 - 11677
(2016/12/09)
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- One-pot, solvent-free and efficient synthesis of 2,4,6-triarylpyridines catalyzed by nano-titania-supported sulfonic acid as a novel heterogeneous nanocatalyst
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Nano titania-supported sulfonic acid (n-TSA) has found to be a highly efficient, eco-friendly and recyclable heterogeneous nanocatalyst for the solvent-free synthesis of 2,4,6-triarylpyridines through one-pot three-component reaction of acetophenones, aryl aldehydes and ammonium acetate. This reported method illustrates several advantages such as environmental friendliness reaction conditions, simplicity, short reaction time, easy work up, reusability of catalyst and high yields of the products. One new compound is reported too. Furthermore, the catalyst could be recycled after a simple work-up, and reused at least six times without substantial reduction in its catalytic activity.
- Tabrizian, Elham,Amoozadeh, Ali,Rahmani, Salman,Imanifar, Elham,Azhari, Saeede,Malmir, Masoumeh
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p. 1278 - 1282
(2015/12/31)
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- An improved and highly efficient one-pot three-component synthesis of 2,4,6-triarylpyridines catalyzed by melamine trisulfonic acid under solvent-free condition
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A facile one-pot synthesis of triarylpyridines as valuable products is reported via three-component condensation reaction in the presence of environmentally benign melamine trisulfonic acid (MTSA) under solvent-free condition. The present protocol offers several advantages including simple work-up procedure, high yields and ease of catalyst isolation with suitable recyclability.
- Mouradzadegun, Arash,Kiasat, Ali Reza,Asareh, Hadi
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p. 943 - 947
(2016/02/18)
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- Nano-Fe3O4-supported, hydrogensulfate ionic liquid-catalyzed, one-pot synthesis of polysubstituted pyridines
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Anchoring 1-methyl-3-(triethoxysilylpropyl) imidazolium chloride onto silica-coated magnetic Fe3O4 particles afforded the corresponding supported ionic liquid. Exchanging the Cl- anion by treating with H2SO4 gave Br?nsted ionic liquid 1-methyl-3-(triethoxysilylpropyl) imidazolium hydrogensulfate. The synthesized catalyst was characterized by various techniques such as infrared, x-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and elemental analyses. The results indicated that the prepared catalyst had a nanostructure. The catalytic activity of the supported ionic liquid was examined in the synthesis of the polysubstituted pyridines by reaction of aromatic aldehydes with acetophenones and ammonium acetate in moderate to good yields under solvent-free conditions. The catalyst can be easily recovered by applying an external magnetic field and reused for at least seven runs without deterioration in catalytic activity.
- Alinezhad, Heshmatollah,Tajbakhsh, Mahmood,Ghobadi, Neda
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supporting information
p. 1964 - 1976
(2015/08/18)
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- The synthesis of polysubstituted pyridines using nano Fe3O4 supported hydrogensulfate ionic liquid
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Reaction of 1-methylimidazole with 3-(trimethoxysilyl)propyl chloride resulted in formation of 1-methyl-3-(trimethoxysilyl)propyl imidazolium chloride ([pmim]Cl). Anchoring of the ionic liquid on to silica-coated magnetic Fe3O4 particles afforded the corresponding supported ionic liquid MNP-[pmim]Cl. Exchanging the Cl- anion by treatment with H2SO4 gave the Bronsted ionic liquid MNP-[pmim]HSO4. FT-IR, XRD, SEM, TEM, TG/DTG, VSM, and CHN analysis were used to characterize the supported ionic liquid. The results indicated the catalyst was a nanostructure. The catalytic activity of the supported ionic liquid was examined in the synthesis of the polysubstituted pyridines by reaction of aromatic aldehydes, and acetophenones or indan-1-one with ammonium acetate under solvent-free conditions. The catalyst could be easily recovered, by applying an external magnetic field, and reused at least six runs without deterioration of its catalytic activity.
- Alinezhad, Heshmatollah,Tajbakhsh, Mahmood,Ghobadi, Neda
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p. 9113 - 9127
(2015/10/28)
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- ORGANIC COMPOUND, CHARGE-TRANSPORTING MATERIAL, AND ORGANIC ELECTROLUMINESCENT ELEMENT
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There are provided an organic having both excellent hole transporting property and satisfactory electron transporting and showing excellent durability against electric oxidation/reduction and a high triplet excitation level, and a charge transporting material and an organic electroluminescent device each using the organic compound. The organic compound is represented by following Formula (I): wherein Cz 1 and Cz 2 each represent a carbazolyl group; Z represents a direct bond or an arbitrary linkage group enabling the conjugation of nitrogen atoms in the carbazole rings of Cz 1 and Cz 2 with each other; and Q represents a direct bond connecting to "G" in following Formula (II): wherein Ring B 1 represents a six-membered aromatic heterocyclic ring having "n" nitrogen atom(s) as hetero atom(s); "n" represents an integer of from 1 to 3; G represents a direct bond or an arbitrary linkage group connecting to Q when G connects to Q; Gs connect to carbon atoms at the ortho-position and the para-position with respect to nitrogen atom(s) in Ring B 1 ; G represents an aromatic hydrocarbon group when G does not connect to Q; and "m" represents an integer of from 3 to 5.
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Paragraph 0194
(2015/09/22)
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- Spectral studies of multi-branched fluorescence dyes based on triphenylpyridine core
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A series of novel triphenylpyridine-containing triphenylamine derivatives have been carefully designed and prepared in good yields using the stepwise route reactions. The relationship of photoluminescence property and structure of compounds 9-13 was syste
- Wang, Hai-Ying,Chen, Liang-Feng,Zhu, Xiu-Ling,Wang, Chao,Wan, Yu,Wu, Hui
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p. 355 - 362
(2014/01/06)
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- Bismuth triflate catalyzed solvent-free synthesis of 2,4,6-triaryl pyridines and an unexpected selective acetalization of tetrazolo[1,5-a]- quinoline-4-carbaldehydes
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Bismuth triflate has been found as a potential catalyst for an efficient and solvent-free synthesis of symmetrical 2,4,6-triarylpyridines in 86-93% yields. Moreover, catalytic reactivity of bismuth triflate toward tetrazolo[1,5-a]quinoline-4-carbaldehydes
- Shinde, Pravin V.,Labade, Vilas B.,Gujar, Jitendra B.,Shingate, Bapurao B.,Shingare, Murlidhar S.
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experimental part
p. 1523 - 1527
(2012/03/27)
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- MATERIAL FOR ORGANIC ELECTROLUMINESCENCE DEVICES AND ORGANIC ELECTROLUMINESCENCE DEVICE USING THE MATERIAL
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A material for organic electroluminescence devices comprising a compound in which a heterocyclic group having nitrogen is bonded to an arylcarbazolyl group or a carbazolylalkylene group and an organic electroluminescence device comprising an anode, a cathode and an organic thin film layer comprising at least one layer and disposed between the anode and the cathode, wherein at least one layer in the organic thin film layer comprises the material for organic electroluminescence devices described above. The material can provide an organic electro-luminescence device emitting bluish light with a high purity of color. The organic electroluminescence device uses the material.
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Page/Page column 41
(2013/02/27)
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- Triphenylpyridine-based star-shaped π-conjugated oligomers with triphenylamine core: Synthesis and photophysical properties
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Two novel star-shaped π-conjugated oligomers bearing a triphenylpyridine moiety as peripheral units and triphenylamine as a core have been synthesized via the threefold Heck/Sonogoshira coupling reaction protocol and their absorption and fluorescence prop
- Jana, Debabrata,Ghorai, Binay K.
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supporting information; experimental part
p. 1798 - 1801
(2012/05/05)
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- Solvent-free, one-pot synthesis of 2,4,6-triarylpyridines using trichloroisocyanuric acid or N-bromosuccinimide as a novel and neutral catalyst
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A simple and benign protocol has been explored for the preparation of 2,4,6-triarylpyridines by a one-pot reaction between aryl aldehydes, enolizable ketones and ammonium acetate in the presence of N-bromosuccinimide or trichloroisocyanuric acid as green and neutral catalysts. The reactions proceed smoothly at 130 °C under solvent-free conditions to provide 2,4,6-triarylpyridines in good yields.
- Maleki, Behrooz,Salehabadi, Hafezeh,Sepehr, Zeinalabedin,Kermanian, Mina
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experimental part
p. 1307 - 1315
(2012/04/04)
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- Green, new and efficient tandem oxidation and conversion of aryl alcohols to 2,4,6-triarylpyridines promoted by [HMIm]NO3-[BMIm]BF4 as a binary ionic liquid
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A novel, clean and efficient tandem process has been established for the synthesis of 2,4,6-triarylpyridines from primary aryl alcohols or 1-arylethanols using 1-methylimidazolium nitrate in 1-butyl-3-methylimidazolium tetrafluoroborate as a binary task-specific ionic liquid under microwave irradiation.
- Khosropour, Ahmad R.,Mohammadpoor-Baltork, Iraj,Kiani, Forough
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experimental part
p. 441 - 445
(2012/03/22)
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- Copper-Catalyzed coupling of oxime acetates with aldehydes: A new strategy for synthesis of pyridines
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Copper-catalyzed coupling of oxime acetates with aldehydes offers a new strategy for the synthesis of highly substituted pyridines. This novel method tolerates a wide range of functionality and allows for rapid elaboration of the oxime acetates into a variety of substituted pyridines.
- Ren, Zhi-Hui,Zhang, Zhi-Yuan,Yang, Bing-Qin,Wang, Yao-Yu,Guan, Zheng-Hui
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supporting information; experimental part
p. 5394 - 5397
(2011/12/02)
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- Wet 2,4,6-trichloro-1,3,5-triazine (TCT) as an efficient catalyst for the synthesis of 2,4,6-triarylpyridines under solvent-free conditions
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An efficient one-pot synthesis of 2,4,6-triarylpyridines has been described. This involves the three-component reaction of aldehydes, ketones and ammonium acetate in the presence of a catalytic amount of wet 2,4,6-trichloro-1,3,5-triazine (TCT) under solvent-free condition at 130 °C.
- Maleki, Behrooz,Azarifar, Davood,Veisi, Hojat,Hojati, Seyede Fatemeh,Salehabadi, Hafezeh,Yami, Razieh Nejat
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experimental part
p. 1346 - 1349
(2011/10/08)
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- Novel solid-supported dimerization-heteroannulation of chalcones: simple and efficient synthesis of 2,4,6-triaryl-3-methylarylpyridines
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2,4,6-Triaryl-3-methylarylpyridines were obtained, in 60-70% yield, by a novel one-pot solventless solid-supported dimerization-heteroannulation reaction of chalcones and compounds possessing terminal -CONH2 functionality, at 125-135 °C, using immobilized Bi(III) nitrate and Zn(II) chloride as co-catalyst. Initially, chalcones were prepared, in nearly quantitative yield, by a modified aldol condensation, in neutral aqueous medium, in the presence of p-toluenesodium sulfonate.
- Verma, Anil K.,Koul, Summon,Pannu, Ajay P.S.,Razdan, Tej K.
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p. 8715 - 8722
(2008/02/10)
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- A new and convenient one-pot solid supported synthesis of 2,4,6-triarylpyridines
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A new, convenient, efficient and cost-effective one-pot solid supported synthesis of 2,4,6-triarylpyridines from benzylideneacetophenones and urea, thiourea or their derivatives, using Bi(III) nitrate-Al2O3 is described. The reaction seems to proceed via β-oxygenation of Bi(III)-enolized benzylideneacetophenone followed by Michael addition, heteroannulation with simultaneous retro aldol disproportionation and subsequent catalytic oxidation and dehydration.
- Kumar, Anil,Koul, Summon,Razdan, Tej K.,Kapoor, Kamal K.
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p. 837 - 842
(2007/10/03)
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- ANTHRACENE DERIVATIVE AND ORGANIC ELECTROLUMINESCENT ELEMENT USING THE SAME
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This invention provides an anthracene derivative, which has a heteroaryl group containing a nitrogen-containing six-membered ring and has a specific structure and comprises an organic thin film layer having a single or multilayer structure including at least a luminescent layer between a cathode and an anode. At least one of the organic thin film layers contains the anthracene derivative either solely or as a component of a mixture. The organic electroluminescent element can emit homogeneous luminscence for a long period of time and has a prolonged service life. The anthracene derivative can realize the above organic electroluminescent element.
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Page/Page column 57-58
(2008/06/13)
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- ORGANIC COMPOUND, CHARGE-TRANSPORTING MATERIAL, AND ORGANIC ELECTROLUMINESCENT ELEMENT
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An organic compound represented by the following formula (I), which combines excellent hole-transporting properties with excellent electron-transporting properties and has excellent long-term resistance to electrical oxidation/reduction and a high triplet excitation level; and a charge-transporting material and an organic electroluminescent element which comprise or employ the organic compound. (I) Cz1 and Cz2 each is carbazolyl; Z is a direct bond or any connecting group which enables the nitrogen atom of the carbazole ring in Cz1 to be conjugated with the nitrogen atom of the carbazole ring in Cz2; and Q represents a direct bond connected to G in the following formula (II). Ring B1 is a 6-membered aromatic heterocycle having n nitrogen atom(s) as a heteroatom, provided that n is an integer of 1-3. When G is connected to Q, it is a direct bond or any connecting group which each is connected to Q. G is bonded to any of the carbon atoms located in the ortho and para positions to a nitrogen atom of the ring B1. When G is not connected to Q, it is an aromatic hydrocarbon group. Symbol m is an integer of 3-5.
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Page/Page column 85-87
(2008/06/13)
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- Kinetics and Mechanisms of Nucleophilic Displacements with Heterocycles as Leaving Groups. Part 4. 2,4,6-Triaryl-N-benzylpyridinium Cations: Rate Variation with Electronic Effects in the Leaving Group
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Electron-withdrawing groups in the 4-phenyl ring of 2,4,6-triphenylpyridine modestly increase its activity as a leaving group.Replacement of 2-phenyl by heteroaryl has a small effect for monoheteroaryl groups, but significantly larger for 2-benzimidazol-2-yl and especially for 2-benzothiazol-1-yl.
- Katritzky, Alan R.,Adamson, Jeffrey,Elisseou, E. Michael,Musumarra, Giuseppe,Patel, Ranjan C.,et al.
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p. 1041 - 1048
(2007/10/02)
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