BiBr3, an efficient catalyst for the benzylation of alcohols: 2-phenyl-2-propyl, a new benzyl-type protecting group
摘要:
The benzylation of aliphatic alcohols with various benzylic alcohols has been achieved in the presence of BiBr3 under mild conditions. 2-Phenylpropan-2-ol proved to be the most efficient and can be considered as a novel protecting group. (C) 2000 Elsevier Science Ltd. All rights reserved.
Efficient addition of alcohols, amines and phenol to unactivated alkenes by AuIII or PdII stabilized by CuCl2
作者:Xin Zhang、Avelino Corma
DOI:10.1039/b714617e
日期:——
The nucleophilic addition of alcohols, amines and phenol to unactivated alkenes catalyzed by cationic gold and palladium becomes limited due to the fast reduction into metallic gold under reaction conditions. The presence of CuCl2 retards the reduction of AuIII and PdII, strongly increasing the turnover number of gold and palladium catalysts. It is shown that new AuIII–CuCl2 and PdII–CuCl2 catalysts
Effective Au(<scp>iii</scp>)–CuCl<sub>2</sub>-catalyzed addition of alcohols to alkenes
作者:Xin Zhang、Avelino Corma
DOI:10.1039/b706961h
日期:——
Alkenes can be activated by Au(III) catalysts, and the effective addition of alcohols to alkenes can be carried out under mild conditions with Au(III), provided that catalytic amounts of CuCl(2) are added, which significantly stabilize the cationic Au(III).
Elaboration of α-substituted benzyl ethers and sulphides by suppression of the Wittig and related rearrangements
作者:Stephen G. Davies、Nicholas J. Holman、Charles A. Laughton、Bryan E. Mobbs
DOI:10.1039/c39830001316
日期:——
Co-ordination of benzyl alkyl ethers and sulphides to chromium tricarbonyl allows α-substitution via the corresponding α-carbanions to be achieved by suppression of the Wittig and related rearrangements.