Aryl Boronic Acid Catalysed Dehydrative Substitution of Benzylic Alcohols for C−O Bond Formation
作者:Susana Estopiñá‐Durán、Liam J. Donnelly、Euan B. Mclean、Bryony M. Hockin、Alexandra M. Z. Slawin、James E. Taylor
DOI:10.1002/chem.201806057
日期:2019.3.12
substitution of benzylicalcohols with a second alcohol to form new C−Obonds. This method has been applied to the intermolecular substitution of benzylicalcohols to form symmetrical ethers, intramolecular cyclisations of diols to form aryl‐substituted tetrahydrofuran and tetrahydropyran derivatives, and intermolecular crossed‐etherification reactions between two different alcohols. Mechanistic control
Selective Sulfonylation of Arenes and Benzoylation of Alcohols Using Lithium Perchlorate as a Catalyst Under Neutral Conditions
作者:B. P. Bandgar、V. T. Kamble、V. S. Sadavarte、L. S. Uppalla
DOI:10.1055/s-2002-25345
日期:——
Sulfonylation of aromatics with p-toluenesulfonyl chloride and benzoylation of alcohols with benzoyl chloride using lithium perchlorate as a catalyst is described. The remarkable selectivity under neutral conditions is an attractive feature of this method
Secondary phosphine oxides O=PHR2 (SPOs) were identified as multitalented preligands for the chemoselective Pd‐catalyzedoxidation of alcohols by a hydrogen‐abstracting methodology. SPOs were found to promote the hydrogen‐abstraction step as well as hydrogen transfer to a Michael acceptor by generating a putative active H−Pd species. The catalytic system operates under neutral conditions and was proven
Highly Practical Copper(I)/TEMPO Catalyst System for Chemoselective Aerobic Oxidation of Primary Alcohols
作者:Jessica M. Hoover、Shannon S. Stahl
DOI:10.1021/ja206230h
日期:2011.10.26
Aerobicoxidation reactions have been the focus of considerable attention, but their use in mainstream organic chemistry has been constrained by limitations in their synthetic scope and by practical factors, such as the use of pure O(2) as the oxidant or complex catalyst synthesis. Here, we report a new (bpy)Cu(I)/TEMPO catalyst system that enables efficient and selective aerobicoxidation of a broad
here for the first time are the developments of an efficient method for oxidativecleavage of carbon−carbon double bonds yielding carbonyl compounds by using aryl-λ3-iodanes, which involve a combination of iodosylbenzene and HBF4 in the presence of water. The method serves as a safety alternative to ozonolysis. The oxidativecleavage of olefins probably involves the hitherto unknown direct vicinal dihydroxylations