The separation of polar and steric effects. Part 14. Kinetics of the reactions of benzoic acid and of ortho-substituted benzoic acids with diazodiphenylmethane in various alcohols
作者:M. Hanif Aslam、Alan G. Burden、Norman B. Chapman、John Shorter、Marvin Charton
DOI:10.1039/p29810000500
日期:——
now discussed are rate coefficients for the reactions of benzoicacid and 32 ortho-substituted benzoicacids with diazodiphenylmethane (DDM) at 30.0 °C in 11 alcohols including 2-methoxyethanol. The reaction involves a rate-determining proton transfer. The results have been subjected to correlation analysis in two ways. (a) For the reactions of a given acid in the various alcohols, the log k values are
Beyond the Tebbe Olefination: Direct Transformation of Esters into Ketones or Alkenes
作者:Anna M. Domżalska-Pieczykolan、Bartłomiej Furman
DOI:10.1055/s-0039-1691594
日期:2020.4
A direct, effective, and operationally simple transformation of esters into ketones or alkenes by the exclusive action of Tebbe’s reagent has been developed. The transformation utilizes the dual character of Tebbe’s reagent as both a methylenation agent and a rearrangement catalyst in the reaction of a wide range of substituted vinyl ethers. The resulting transformation involves sequential methylenation
An Efficient Metal-Free Oxidative Esterification and Amination of Benzyl C–H Bond
作者:Saiwen Liu、Ru Chen、Guowen He、Jin Zhang
DOI:10.3390/molecules25071527
日期:——
An esterification and amination of benzylic C–H bonds was developed by using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) under metal- and iodide-free conditions. Both carboxylic acids and amines could be used as ideal coupling partners for the oxidative coupling reactions with various diarylmethanes. A close to equal amount of coupling reagents was enough to afford the product in good to high yields