Transportation (2,3) de Wittig des éthers d'allyle ou crotyle et de benzyle chrome tricarbonyle
摘要:
The (2,3) Wittig rearrangement of ortho-substituted benzyl tricarbonyl chromium allyl ether occurs with complete stereoselectivity. The ortho-substituted benzyl tricarbonyl chromium E crotyl ether gives exclusively erythro diastereoisomer, the Z isomer gives a mixture (ratio 59/41) of threo and erythro diastereoisomers.
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.