Selective Oxidative Homo- and Cross-Coupling of Phenols with Aerobic Catalysts
摘要:
Simple catalysts that use atom-economical oxygen as the terminal oxidant to accomplish selective ortho-ortho, ortho-para, or para-para homo-couplings of phenols are described. In addition, chromium salen catalysts have been discovered as uniquely effective in the cross-coupling of different phenols with high chemo- and regioselectivity.
The present disclosure provides compounds of formula (I) or salts thereof, wherein R1- R10 and x are defined herein; compositions containing these compounds; methods of inhibiting, reducing, or ameliorating bacterial growth on a substrate using these compound; and products such as dental care products, soaps, antibacterial products, and plastics comprise one or more compounds described herein.
[DE] STERISCH ANSPRUCHSVOLLE CHELATPHOSPHINITPHOSPHITLIGANDEN, KATALYSATOR, UMFASSEND WENIGSTENS EINEN NICKEL (0) KOMPLEX STABILISIERT DURCH DIESEN LIGANDEN SOWIE EIN VERFAHREN ZUR HERSTELLUNG VON NITRILEN<br/>[EN] STERICALLY HINDERED CHELATE PHOSPHINITE-PHOSPHITE LIGAND, CATALYST, COMPRISING AT LEAST ONE NICKEL(0) COMPLEX STABILIZED BY SAID LIGAND AND METHOD FOR PRODUCTION OF NITRILES<br/>[FR] LIGAND PHOSPHITE-PHOSPHINITE CHELATE A ENCOMBREMENT STERIQUE, CATALYSEUR COMPRENANT AU MOINS UN COMPLEXE DE NICKEL (0) STABILISE PAR CE LIGAND ET PROCEDE DE PRODUCTION DE NITRILES
申请人:BASF AG
公开号:WO2005042547A1
公开(公告)日:2005-05-12
Beschrieben werden Phosphinitphosphite I der Formel 1 oder 2 oder 3 oder 4 oder 5 oder 6 mit R1, R2, R4 sind unabhängig voneinander eine Alkyl- oder Alkylengruppe mit 1 bis 8 Kohlenstoffatomen, mit der Maßgabe, dass mindestens eine der Gruppen R1, R2, R4 ungleich H ist, R5 bis R22 sind unabhängig voneinander H, eine Alkyl- oder Alkylengruppe mit 1 bis 8 Kohlenstoffatomen, R3 ist H, Methyl oder Ethyl, X ist F, Cl oder CF3, wenn n gleich 1 oder 2 ist, X ist H, wenn n gleich 0 ist. und deren Gemische.
Enantioselective Vanadium-Catalyzed Oxidative Coupling: Development and Mechanistic Insights
作者:Houng Kang、Madison R. Herling、Kyle A. Niederer、Young Eun Lee、Peddiahgari Vasu Govardhana Reddy、Sangeeta Dey、Scott E. Allen、Paul Sung、Kirsten Hewitt、Carilyn Torruellas、Gina J. Kim、Marisa C. Kozlowski
DOI:10.1021/acs.joc.8b02083
日期:2018.12.7
vanadium catalyst for enantioselectiveoxidativecoupling of phenols is reported, ultimately resulting in a simple monomeric vanadium species combined with a Brønsted or Lewis acid additive. The resultant vanadium complex is found to effect the asymmetric oxidative ortho–ortho coupling of simple phenols and 2-hydroxycarbazoles with good to excellent levels of enantioselectivity. Experimental and quantum
Asymmetric Oxidative Coupling of Phenols and Hydroxycarbazoles
作者:Houng Kang、Young Eun Lee、Peddiahgari Vasu Govardhana Reddy、Sangeeta Dey、Scott E. Allen、Kyle A. Niederer、Paul Sung、Kirsten Hewitt、Carilyn Torruellas、Madison R. Herling、Marisa C. Kozlowski
DOI:10.1021/acs.orglett.7b02552
日期:2017.10.20
The first examples of asymmetricoxidativecoupling of simple phenols and 2-hydroxycarbazoles are outlined. Generation of a more vanadium catalyst by ligand design and by addition of an exogenous Brønsted or Lewis acid was found to be key to coupling the more oxidatively resistant phenols. The resultant vanadium complex is both more Lewis acidic and more strongly oxidizing. Good to excellent levels
概述了简单酚和 2-羟基咔唑的不对称氧化偶联的第一个例子。通过配体设计和添加外源布朗斯特酸或路易斯酸生成更多钒的催化剂被发现是偶联更具抗氧化性的酚的关键。所得的钒络合物具有更强的路易斯酸性和更强的氧化性。可以获得良好至优异的对映选择性,并且简单的研磨即可轻松提供≥95% ee 的产品。
Multidentate phosphite ligands, catalytic compositions containing such ligands, and catalytic prosses utilizing such catalytic compositions
申请人:——
公开号:US20030023110A1
公开(公告)日:2003-01-30
Multidentate phosphite ligands are disclosed for use in reactions such as hydrocyanation and isomerization. The catalyst compositions made therefrom and the various catalytic processes which employ such multidentate phosphite ligands are also disclosed. In particular, the ligands have heteroatom-containing substituents on the carbon attached to the ortho position of the terminal phenol group.