A novel preparative method for unsymmetrical ethers by the reaction of cocrystals of two similarly substituted secondary alcohols with toluene-p-sulphonic acid in the solid state
Thiazolium-Based Catalysts for the Etherification of Benzylic Alcohols under Solvent-Free Conditions
作者:Lucia Anna Bivona、François Quertinmont、Hazi Ahmad Beejapur、Francesco Giacalone、Mireia Buaki-Sogo、Michelangelo Gruttadauria、Carmela Aprile
DOI:10.1002/adsc.201400733
日期:2015.3.9
propose a reaction mechanism. The supported thiazolium‐based material was successfully used in the etherification reaction of two other benzylicalcohols and also in seven consecutive cycles. This work represents the first use of thiazolium‐based compounds as catalysts for the etherification reaction of alcohols.
Gold Catalysis: Alkyl Migration in the Addition of Alcohols to Nitriles
作者:Nada Ibrahim、A. Stephen K. Hashmi、Frank Rominger
DOI:10.1002/adsc.201000779
日期:2011.2.11
symmetrical ethers and/or N-substituted carboxylic amides. While with most phosphane ligands tested, the dominating product is always the ether, with the trimesitylene ligand the amides are the major products. The reaction conditions are much milder than those reported previously. Mechanistic control experiments with a chiral alcohol prove the intermediacy of carbenium ions, furtherstudies with not readily
alkylation, and trifluoromethanesulfonic acid (triflic acid, TfOH) was also a good catalyst. The catalytic activity of metal triflates and TfOH increased in the order La(OTf)3 < Yb(OTf)3 < TfOH < Sc(OTf)3 < Hf(OTf)4. A mechanistic study was also performed. The reaction of 1-phenylethanol (4a) in the presence of Sc(OTf)3 in nitromethane gave an equilibrium mixture of 4a and bis(1-phenylethyl) ether (54). Addition
Organohalide-catalyzed dehydrative O-alkylation between alcohols: a facile etherification method for aliphatic ether synthesis
作者:Qing Xu、Huamei Xie、Pingliang Chen、Lei Yu、Jianhui Chen、Xingen Hu
DOI:10.1039/c5gc00284b
日期:——
Organohalides effectively catalyzed dehydrative O-alkylation reactions between alcohols, providing selective, practical, green, and easily scalable homo- and cross-etherification methods for the preparation of useful symmetrical and unsymmetrical aliphatic ethers.
Silver triflate mediated dehydration of benzylic alcohols and vinyl hydrovinylation of styrene
作者:Brandon Quillian、Alexis E. Fields、Desiree Chace、Amanda Murrell Vickery、Mrinali Sharma、Dane Zurwell、Joseph G. Bazemore、Long Phan、Dorey Thomas、Clifford W. Padgett
DOI:10.1016/j.ica.2019.02.015
日期:2019.4
catalysis. Presented herein are new reactions that are either catalyzed or promoted by the “hidden” acid, generated upon silver triflate degradation. 1-Phenylethanol dehydrates to styrene (1) upon reaction with AgOTf at 90 °C over 24 h, which slowly coverts to the vinyl hydrovinylation product (E)-1,3-diphenyl-1-butene, (2, 64%) over several days. While dehydration was observed with a number of benzylic