- Cubane and step-form structures of dilithium bis(aryloxy)phosphines
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The lithium complexes RP(3,5-tBu2C6H 2OLi)2(THF)4, where R = Ph or iPr, (R[OPO]Li2)2(THF)4, synthesized by reaction of the 2-bromo-4,6-di-tert-butylphenol with BuLi and the appropriate dichlorophosphine, possess solid state structures composed of lithium oxide tetragons arranged in a step-form or face sharing half-cubane arrangements. Incorporation of excess lithium aryloxide results in the formation of complexes that display an extended step-form structure, [Ph[OPO]Li 2(ArOLi)]2, or a distorted cubane arrangement of tetragons, [iPr[OPO]Li3Cl(ArOLi)](THF)3. The Royal Society of Chemistry.
- Carmichael, Christopher D.,Fryzuk, Michael D.
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Read Online
- Copper(I) and copper(II) complexes possessing cross-linked imidazole-phenol ligands: Structures and dioxygen reactivity
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Catalytic reduction of O2 to H2O, and coupling to membrane proton translocation, occurs at the heterobinuclear heme a3-CuB active site of cytochrome c oxidase. One of the CuB ligated histidines is cross-linked to a neighboring tyrosine (C-N bond; tyrosine C6 and histidine ε-nitrogen), and the protic residue of this cross-linked His-Tyr moiety is proposed to participate as both an electron and a proton donor in the catalytic dioxygen reduction event. To provide insight into the chemistry of such a moiety, we have synthesized and characterized tetra- and tridentate pyridylalkylamine chelate ligands {LN4OR and LN3OR (R = H or Me)}, which include an imidazole-phenol (or anisole) cross-link and their copper(I/II) complexes. [CuI(LN4OH)]B(C6F5)4 (1) reacts with dioxygen at -80 °C in THF, forming an unstable trans-μ-1,2-peroxodicopper(II)complex, which subsequently converts to a dimeric copper(II)-phenolate complex [{Cu(LN4O-)}2](B(C6F5)4)2 (5a). The close analogue [CuI(LN4OMe)]B(C6F5)4 (3) binds dioxygen reversibly at -80 °C in tetrahydrofuran. Stopped-flow kinetics of the reaction [CuI(LN3OH)]ClO4 (2) with O2 in CH2Cl2 indicate a steady formation of the purple dimeric product [{Cu(LN3O-)}2](ClO4)2 (5b), which has been analyzed in the temperature range from -40 to +20 °C, ΔH? = -9.6 (6) kJ mol-1, ΔS? = -168 (2) J mol-1 K-1 (k(-40°C) = 1.05(4) × 106 and k(+20°C) = 4.6(2) × 105 M-2 s-1). The X-ray crystal structures of 1, [CuII(LN3OH)(MeOH)(OClO3-)](ClO4) (4), 5a, and 5b are reported. Copyright
- Kamaraj, Kaliappan,Kim, Eunsuk,Galliker, Benedikt,Zakharov, Lev N.,Rheingold, Arnold L.,Zuberbuehler, Andreas D.,Karlin, Kenneth D.
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Read Online
- Supported permethylindenyl titanium catalysts for the synthesis of disentangled ultra-high molecular weight polyethylene (: Dis UHMWPE)
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Novel permethylindenyl-phenoxide (PHENI?) ansa-metallocene titanium complexes have been synthesised and immobilised on inorganic solid supports to afford highly effective catalysts for slurry-phase ethylene polymerisation. When supported on solid polymeth
- Buffet, Jean-Charles,Collins Rice, Clement G.,O'Hare, Dermot,Turner, Zo? R.
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supporting information
p. 8600 - 8603
(2021/09/02)
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- Ni, Pd, and Pt complexes of a tetradentate dianionic thiosemicarbazone-based O^N^N^S ligand
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New tetradentate phenolate O^N^N^S thiosemicarbazone (TSC) ligands and their Ni(ii), Pd(ii) and Pt(ii) complexes were studied. The diamagnetic and square planar configured orange or red complexes show reversible reductive electrochemistry and in part reversible oxidative electrochemistry at very moderate potentials. DFT calculations show essentially pyridyl-imine centred lowest unoccupied molecular orbitals (LUMO) while the highest occupied molecular orbitals (HOMO) receive contributions from the phenolate moiety, the metal d orbitals and the TSC thiolate atom in keeping with UV-vis spectroelectrochemistry. DFT calculations in conjunction with IR spectra showed details of the molecular structures, the UV-vis absorptions were modelled through TD-DFT calculation with very high accuracy. UPS is fully consistent with UV-vis absorption and TD-DFT calculated data and shows decreasing HOMO-LUMO gaps along the series Pd > Pt > Ni.
- Haseloer, Alexander,Denkler, Luca Mareen,Jordan, Rose,Reimer, Max,Olthof, Selina,Schmidt, Ines,Meerholz, Klaus,H?rner, Gerald,Klein, Axel
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p. 4311 - 4322
(2021/04/06)
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- Phosphasalalen Rare-Earth Complexes for the Polymerization of rac-Lactide and rac-β-Butyrolactone
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A series of new phosphasalalen pro-ligands, analogues of salalen but with an iminophosphorane replacing the imine functionality, and their corresponding rare-earth alkoxide and siloxide complexes were synthesized. The multinuclear NMR spectra and X-ray diffraction analyses revealed that, for the tert-butoxide and ethoxide complexes, the resulting phosphasalalen rare-earth product was composed of a mononuclear alkoxide and a binuclear complex containing bridged alkoxo and hydroxo groups, while an analogous binuclear complex was isolated as the sole product for the siloxide complex. All the complexes could catalyze the heteroselective ring-opening polymerization (ROP) of rac-lactide (Pr up to 0.77) with high catalytic activities and a controlled polydispersity. Remarkably, the yttrium and lutetium phosphasalalen complexes could also efficiently catalyze the ROP of rac-β-butyrolactone to produce syndiotactic polymers (Pr up to 0.73) while their salalen analogues were inert, revealing the special effects of the iminophosphorane moiety. Detailed end-group analyses and kinetic investigations suggested that the alkoxo-hydroxo-bridged complexes maintained their binuclear structures in the polymerization.
- Liu, Hui,Shi, Xiaochao
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p. 705 - 717
(2021/02/05)
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- Selective Bromination of β-Positions of Porphyrin by Self-Catalytic Behaviour of VOTPP: Facile Synthesis, Electrochemical Redox Properties and Catalytic Application
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Oxidovanadium(IV) complex of β-octabromo-meso-tetraphenylporphyrin, {[VIVO(TPPBr8)], 2} was synthesized by self-catalytic oxidative bromination of meso-tetraphenylporphyrinatooxidovanadium(IV) {[VIVO(TPP), 1} in excellent yield under mild conditions at 25 °C and its structure was confirmed by single crystal X-ray study. UV-Vis and 1H NMR spectra further confirmed that the meso-phenyl rings are not brominated and thus emphasizes on the selectivity as well as synthetic importance of this catalytic method. In the presence of substrates e. g. phenol derivatives, 1 biomimics the vanadium bromoperoxidase (VBPO) enzyme and catalyses the oxidative bromination of substrates in water at 25 °C. Remarkably, 2 also catalyses the oxidative bromination of phenol derivatives under similar reaction conditions with very high turnover frequency (TOF) values (ca. 29 s?1) along with its recyclability. It was found that 2 showed superior catalytic performance as compared to 1 because of its electron deficient nature due to electron withdrawing bromo substituents and robust saddle shaped nonplanar structure (further supported by DFT studies).
- Maurya, Mannar R.,Prakash, Ved,Avecilla, Fernando,Sankar, Muniappan
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p. 1685 - 1694
(2021/05/03)
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- COMPOSITIONS AND METHODS FOR IMMUNE MODULATION AND TREATMENT OF CANCER
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The disclosure relates to rexinoids, including compounds of the Formula (I) and (II) or a pharmaceutically acceptable salt, polymorph, prodrug, solvate or clathrate thereof. These rexinoids are useful for increasing PD-L1 in vivo, for treatment of cancer, and for inhibiting the onset of cancer.
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Paragraph 0175
(2020/07/31)
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- Biphenol compound as well as preparation method and application thereof
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The invention discloses a biphenyl triphenol compound. The compound has a structure as shown in the following formula (I). The biphenyl triphenol compound provided by the invention is an important intermediate for synthesizing a tridentate phosphite ligand of a biphenyl frame, and plays an important role in hydroformylation reaction and industrial application thereof. The invention also provides preparation methods of various biphenol compounds, including an oxidative coupling method; the oxidative coupling method provided by the invention can be used for synthesizing the biphenol compounds inone step; and the method has the advantages of cheap and easily available catalyst, simple operation, good yield, low cost and large-scale preparation.
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Paragraph 0106; 0115-0118
(2020/10/20)
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- Biphenyltridentate phosphite ligand and preparation method and application thereof (by machine translation)
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The invention discloses a biphenyl tridentate phosphite ligand and a preparation method and application thereof, wherein the biphenyltridentate phosphite ligand has the structure shown in a formula (I), and the ligand has extremely stable water oxygen. The catalyst is not easy to decompose and has good catalytic activity. (by machine translation)
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Paragraph 0096; 0105-0108
(2020/11/10)
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- A new bis-phenolate mesoionic carbene ligand for early transition metal chemistry
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We report the synthesis of a new pincer-type triazolylidene ligand precursor H3L[Cl] with redox-active 3,5-di-tert-butylphenolate substituents on a multigram scale following a converging ten-step route. The potential of this new mesoionic carbe
- Baltrun, Marc,Watt, Fabian A.,Schoch, Roland,W?lper, Christoph,Neuba, Adam G.,Hohloch, Stephan
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supporting information
p. 14611 - 14625
(2019/10/16)
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- Synthesis of Ti-Al binary oxides and their catalytic application for C-H halogenation of phenols, aldehydes and ketones
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Traditional C–H halogenation of organic compounds often requires corrosive agent or harsh condition, and current researches are focused on the use of noble metals as catalyst. In order to give an efficient, benign, activity-adjustable and cost-effective system for halogenation, a series of Ti-Al mixed oxides are prepared as catalyst through sol-gel in this work. Characterizations reveal all catalysts contain more aluminum than titanium, but preparative conditions affect their composition and crystallinity. Monitoring of particle size, zeta potential and UV–vis of preparative solution reveals that formation of catalyst colloids undergoes chemical reaction, affecting catalyst morphology. In halogenation, all catalysts show moderate to high activities, copper chloride proves to be an effective halogen source rather than sodium chloride. The chlorination and bromination are better than iodization, phenol and ketone appear to be more appropriate substrates than aldehyde. Additionally, oxide backbone of catalyst is more durable than its organic components during recycling. This study may provide new catalytic materials for progress of C–H activation.
- Su, Peigen,Fan, Chao,Yu, Heng,Wang, Wanqin,Jia, Xin,Rao, Qifan,Fu, Chenxi,Zhang, Donghua,Huang, Benhua,Pan, Cheng,Zheng, Aqun,Sun, Yang
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- Chiral 2-(2-hydroxyaryl)alcohols (HAROLs) with a 1,4-diol scaffold as a new family of ligands and organocatalysts
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Efficient and modular syntheses of chiral 2-(2-hydroxyaryl)alcohols (HAROLs), novel 1,4-diols carrying one phenolic and one alcohol hydroxyl group, have been developed which led to generation of a small library of structurally diverse HAROLs in enantiomerically pure form. Of the different HAROLs examined, a HAROL based on the indan backbone exhibited the highest activity and enantioselectivity in the 1,2-addition of certain organometallic compounds to aldehydes in the presence of Ti(OiPr)4 (up to 97% y, 88% ee) and performed as a hydrogen-bond donor organocatalyst in the Morita-Baylis-Hillman reaction, promoted by trialkylphosphines.
- Dilek, ?mer,Tezeren, Mustafa A.,Tilki, Tahir,Ertürk, Erkan
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supporting information
p. 268 - 286
(2017/12/06)
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- Electrocatalytic Reduction of CO2 to Formate by an Iron Schiff Base Complex
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The synthesis, structural characterization, and reactivity of an iron(III) chloride compound of 6,6′-di(3,5-di-tert-butyl-2-hydroxybenzene)-2,2′-bipyridine (Fe(tbudhbpy)Cl), under electrochemically reducing conditions is reported. In the presence of carbon dioxide (CO2) under anhydrous conditions in N,N-dimethylformamide (DMF), this complex mediates the 2e- reductive disproportionation of two equivalents of CO2 to carbon monoxide (CO) and carbonate (CO32-). Upon addition of phenol (PhOH) as a proton source under CO2 saturation, catalytic current is observed; product analysis from controlled potential electrolysis experiments shows the majority product is formate (68 ± 4% Faradaic efficiency), with H2 as a minor product (30 ± 10% Faradaic efficiency) and minimal CO (1.1 ± 0.3% Faradaic efficiency). On the basis of data obtained from cyclic voltammetry and infrared spectroelectrochemistry (IR-SEC), the release of CO from intermediate Fe carbonyl species is extremely slow and undergoes competitive degradation, limiting the activity and lifetime of this catalyst. Mechanistic studies also indicate the phenolate moieties coordinated to Fe are sensitive to protonation in the reduced state, suggesting the possibility of cooperative pendent proton interactions being involved in CO2 reduction.
- Nichols, Asa W.,Chatterjee, Sayanti,Sabat, Michal,MacHan, Charles W.
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p. 2111 - 2121
(2018/02/27)
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- Electrocatalytic Reduction of Dioxygen to Hydrogen Peroxide by a Molecular Manganese Complex with a Bipyridine-Containing Schiff Base Ligand
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The synthesis and electrocatalytic reduction of dioxygen by a molecular manganese(III) complex with a tetradentate dianionic bipyridine-based ligand is reported. Electrochemical characterization indicates a Nernstian dependence on the added proton source for the reduction of Mn(III) to Mn(II). The resultant species is competent for the reduction of dioxygen to H2O2 with 81 ± 4% Faradaic efficiency. Mechanistic studies suggest that the catalytically active species has been generated through the interaction of the added proton donor and the parent Mn complex, resulting in the protonation of a coordinated phenolate moiety following the single-electron reduction, generating a neutral species with a vacant coordination site at the metal center. As a consequence, the active catalyst has a pendent proton source in close proximity to the active site for subsequent intramolecular reactions.
- Hooe, Shelby L.,Rheingold, Arnold L.,MacHan, Charles W.
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p. 3232 - 3241
(2018/03/13)
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- Chiral Phosphine–Phosphite Ligands in Asymmetric Gold Catalysis: Highly Enantioselective Synthesis of Furo[3,4-d]-Tetrahydropyridazine Derivatives through [3+3]-Cycloaddition
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The AuI-catalyzed reaction of 2-(1-alkynyl)-2-alken-1-ones with azomethine imines regio- and diastereoselectively affords furo[3,4-d]tetrahydropyridazines in a tandem cyclization/intermolecular [3+3]-cycloaddition process under mild conditions.
- Du, Qingwei,Neud?rfl, J?rg-Martin,Schmalz, Hans-Günther
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supporting information
p. 2379 - 2383
(2018/01/27)
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- Photoinduced Synthesis of Dibenzofurans: Intramolecular and Intermolecular Comparative Methodologies
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The SRN1 reaction has been used as a powerful tool for the synthesis of heterocycles, and only a few studies about photoinduced intramolecular cyclization to generate a new C-O bond by a radical pathway have been reported. This work introduces two strategies for the synthesis of substituted dibenzofurans by electron transfer (eT) reactions. The first one is a three-step process that comprises bromination of o-arylphenols, Suzuki-Miyaura cross-coupling and photoinduced cyclization in order to obtain the above-mentioned products. The second one is a metal-free procedure and does not require any photocatalyst. Different solvents were tested, and the yields ranged from low to moderate. A comparison was established between both methodologies, showing that the second one is the most suitable for the synthesis of dibenzofurans.
- Camargo Solórzano, Patricia,Brigante, Federico,Pierini, Adriana B.,Jimenez, Liliana B.
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supporting information
p. 7867 - 7877
(2018/06/11)
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- Hexamethonium bis(tribromide) (HMBTB) a recyclable and high bromine containing reagent
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A recyclable and high bromine containing di-(tribromide) reagent, hexamethonium bis(tribromide) (HMBTB) has been synthesized and utilized for the bromination of various organic substrates. The spent reagent hexamethonium bromide (HMB) can be effectively recycled by regenerating and reusing it without significant loss of activity. The crystalline and stable bis(tribromide) is an effective storehouse of very high percentage of active bromine requiring just half an equivalent of it for complete bromination. Both the Br3- moieties in HMBTB are nearly linear with Br-Br-Br angle of 179.55°.
- Paul, Bappi,Bhuyan, Bishal,Purkayastha, Debraj D.,Dhar, Siddhartha S.,Patel, Bhisma K.
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p. 5646 - 5650
(2015/09/21)
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- Synthesis and structure of salts of a sterically shielded, lipophilic, C2-symmetric, fluxional aluminate
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Multi-gram amounts of halogen-free lipophilic aluminate salts have been prepared, featuring two sterically demanding chelating ligands derived from a methane-2,2'-bisphenolate. The ligand is prepared by condensation of two equivalents of 2,4-di-tert-butyl
- Soehner, Timo,Kueppers, Ina K.,Wackerow, Wiebke,Rominger, Frank,Straub, Bernd F.
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p. 296 - 318
(2014/06/10)
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- Yttrium phosphasalen initiators for rac-lactide polymerization
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A series of highly active yttrium phosphasalen initiators for the heteroselective ring-opening polymerization of rac-lactide are reported. The initiators are yttrium alkoxide complexes ligated by iminophosphorane analogues of the popular "salen" ligand, t
- Clare,Cao, Thi-Phuong-Anh,Le Goff, Xavier F.,Long, Nicholas J.,Auffrant, Audrey,Williams, Charlotte K.
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supporting information
p. 1475 - 1483
(2013/05/09)
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- TARTROL-derived chiral phosphine-phosphite ligands and their performance in enantioselective Cu-catalyzed 1,4-addition reactions
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By using (R,R,R,R)-2,3-dimethoxy-2,3-dimethyl-1,4-dioxane-5,6-bis- diphenylmethanol (TARTROL) as a chiral building block, a set of six modular phosphine-phosphite ligands (with a 1,2-phenylene backbone) were synthesized and evaluated in the Cu-catalyzed a
- Dindaroglu, Mehmet,Akyol, Sema,Simsir, Hamza,Neudoerfl, Joerg-Martin,Burke, Anthony,Schmalz, Hans-Guenther
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p. 657 - 662
(2013/07/11)
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- Yttrium phosphasalen initiators for rac -lactide polymerization: Excellent rates and high iso-selectivities
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Highly active yttrium phosphasalen initiators for the stereocontrolled ring-opening polymerization of rac-lactide are reported. The initiators are coordinated by a new class of ancillary ligand: an iminophosphorane derivative of the popular "salen" ligand
- Bakewell, Clare,Cao, Thi-Phuong-Anh,Long, Nicholas,Le Goff, Xavier F.,Auffrant, Audrey,Williams, Charlotte K.
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supporting information
p. 20577 - 20580
(2013/02/23)
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- Aerobic oxybromination of phenols catalyzed by sodium nitrite under mild conditions
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An efficient catalytic system for oxybromination of phenols under mild conditions has been developed, which utilizes sodium nitrite as the catalyst, dioxygen or air as the terminal oxidant, aqueous hydrobromic acid or molecular bromine as the bromine resource. From both the atom-economic and environmental points of view, the developed protocol is expected to provide a valuable synthetic method for practical applications in laboratory or industry. Georg Thieme Verlag Stuttgart - New York.
- Xu, Li,Wang, Yong,Wen, Xin,Ding, Chengrong,Zhang, Guofu,Liang, Xinmiao
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supporting information; experimental part
p. 2265 - 2269
(2011/10/31)
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- Asymmetrie hydroformylation using Taddol-based chiral phosphine - Phosphite ligands
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A small library of 17 modular and easily accessible phenol-derived chiral phosphine - phosphite ligands was evaluated in the asymmetric Rh-catalyzed hydroformylation of styrene. It was found that the stereochemical outcome of the reaction is highly dependent on the chiral phosphite moiety and the substituents on the phenolic backbone. Among the ligands studied, Taddol-based ligands of type 10 bearing bulky substituents in ortho-position to the phosphite performed best, with enantioselectivities of up to 85% ee and regioselectivities of ≥98:2. High-pressure NMR of the active catalyst [HRh(P-P)(CO)2] (P-P = 10h) revealed an equatorial-apical coordination of the ligand at rhodium. Temperature dependency of the coupling constants observed during the experiment indicates equilibrium between the two equatorial-apical isomers, with the isomer in which the phosphite occupies the equatorial position being the dominant species.
- Robert, Tobias,Abiri, Zohar,Wassenaar, Jeroen,Sandee, Albertus J.,Romanski, Steffen,Neudoerfl, Joerg-Martin,Schmalz, Hans-Guenther,Reek, Joost N. H.
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scheme or table
p. 478 - 483
(2010/04/01)
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- Synthesis of biaryl compounds through three-component assembly: Ambidentate effect of the tert-butyldimethylsilyl group for regioselective diels-alder and hiyama coupling reactions
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Two for the price of one: A method has been developed for the regiocontrolled synthesis of multisubstituted biaryl derivatives. This protocol involves the use of the tert-butyldimethylsilyl (TBDMS) group to direct the regioselective Diels-Alder reaction of a 3-TBDMS-benzyne with a furan derivative and a subsequent Hiyama cross-coupling reaction of the TBDMS group with aryl iodides (see scheme).
- Akai, Shuji,Ikawa, Takashi,Takayanagi, Sho-Ichi,Morikawa, Yuki,Mohri, Shinya,Tsubakiyama, Masaya,Egi, Masahiro,Wada, Yasufumi,Kita, Yasuyuki
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supporting information; experimental part
p. 7673 - 7676
(2009/04/10)
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- Modular synthesis of chiral phosphine-phosphite-ligands from phenolic precursors: A new approach to bidentate chelate ligands exploiting a P-O to P-C migration rearrangement
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An efficient and modular approach to bidentate phosphine-phosphite ligands formally derived from a 6-alkyl-2-phosphanylphenol, a chiral diol and phosphorus trichloride has been developed. In a key step, a borane-protected phosphinite, prepared from an o-b
- Velder, Janna,Robert, Tobias,Weidner, Ingo,Neudoerfl, Joerg-Martin,Lex, Johann,Schmalza, Hans-Guenther
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supporting information; experimental part
p. 1309 - 1315
(2009/05/30)
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- NON-METALLOCENE ORGANOMETALLIC COMPLEXES AND RELATED METHODS AND SYSTEMS
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A non-metallocene organometallic complex comprising a tridentate ligand and a metal bonded to a tridentate ligand, wherein two substituted aryl groups in the tridentate ligand are connected to a cyclic group at the ortho position via semi-rigid ring-ring linkages, and selected so to provide the resulting non-metallocene organometallic complex with a CS geometry, a C1 geometry, a C2 geometry or a C2v geometry. Method for performing olefin polymerization with a non-metallocene organometallic complex as a catalyst, related catalytic systems, tridentate ligand and method for providing a non-metallocene organometallic complex.
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Page/Page column 30-31
(2008/06/13)
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- Urotropin synthesis of 3,5-di-tert-butylsalicylic acid derivatives
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The stability of 3,5-di-tert-butylsalicylic aldehyde against oxidation is due to autoinhibiting of the chain process. However its oxidation into 3,5-di-tert-butylsalicylic acid was performed at the use of acetyl protection of the hydroxy group. In reaction of 6-bromo-2,4-di-tert-butylphenol with urotropin the formation was discovered of 3,5-di-tert-butylsalicylic acid, its nitrile and amide.
- Vol'eva,Belostotskaya,Komissarova,Kurkovskaya,Pleshakova,Prokofeva
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p. 1488 - 1491
(2008/09/16)
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- A new recyclable ditribromide reagent for efficient bromination under solvent free condition
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1,2-Dipyridiniumditribromide-ethane (DPTBE) has been synthesized and explored as a new efficient brominating agent. The crystalline ditribromide reagent is stable for months and acts as a safe source of bromine requiring just 0.5 equiv for complete bromination. It has high active bromine content per molecule and shows a remarkable reactivity compared to other tribromide reagents toward various substrates by just grinding the reagent and substrates in a porcelain mortar at room temperature. No organic solvent has been used during any stage of the reaction for substrates giving product as solid. Product can easily be isolated by just washing the highly water soluble 1,2- dipyridiniumdibromide-ethane (DPDBE) from the brominated product. The spent reagent can be recovered, regenerated, and reused without any significant loss.
- Kavala, Veerababurao,Naik, Sarala,Patel, Bhisma K.
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p. 4267 - 4271
(2007/10/03)
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- Oxidatively robust monophenolate-copper(II) complexes as potential models of galactose oxidase.
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Cupric complexes of a novel phenanthroline-phenolate ligand have strongly distorted coordination geometries and electrochemical properties conducive to modeling the spectroscopy and reactivity of the enzyme galactose oxidase.
- Gebbink, Robertus J M Klein,Watanabe, Masayuki,Pratt, Russell C,Stack, T Daniel P
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p. 630 - 631
(2007/10/03)
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- Isolation, structural and spectroscopic investigations of complexes with tridentate [O,P,O] and [O,O,O] donor ligands
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A phosphorus-containing potentially tridentate ligand bis(3,5-di-fer/-butyl-2-hydroxyphenyl)phenylphosphine H2L, 1, was prepared. 1 reacts directly in solution with aerial oxygen or hydrogen peroxide to form bis(3,5-di-/e/7butyl-2-hydroxyphenyl)phenylphos
- Siefcrt, Rolf,Wcyhcrmueller, Thomas,Chaudhuri, Phalguni
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p. 4656 - 4663
(2007/10/03)
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- Substituted heteroarylamides having retinoid-like biological activity
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Compounds of the formula STR1 wherein the symbols have the meaning described in the specification, have retinoid-like biological activity.
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- Solid-phase bromination of hindered phenols
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The solid-phase bromination of a series of tert-butyl-substituted phenols with N-bromosuccinimide and dioxane dibromide afforded halogenated cyclohexadienones, quinobromides. Under the extrusion conditions, the latter underwent further transformations, mainly, debromination. A new reaction, dioxane dibromide catalyzed anhydro-heterocyclization of 2,2′-dihydroxy-3,3′,5,5′-tetra-tert-butyldiphenyl to 2,4,6,8-tetra-tert-butyldibenzofuran, was discovered and the mechanism of this reaction was proposed.
- Vol'eva,Belostotskaya,Komissarova,Ershov
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p. 1249 - 1251
(2007/10/03)
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