The addition of Grignardreagents to ketones is significantly enhanced by cerium chloride with remarkable suppression of side reactions, particularly enolization. Some esters, which are prone to side reactions, also react readily with Grignardreagents in the presence of cerium chloride to give normal reaction products in reasonable to high yields.
Vinyllithiums from butyl-vinyl tellurides and bis-vinyl tellurides
作者:Simone M. Barros、João V. Comasseto、Jorge Berriel
DOI:10.1016/s0040-4039(00)70695-2
日期:1989.1
Butyl vinyl tellurides and bis-vinyl tellurides furnish vinyllithiums with retention of configuration in good yields upon treatment with n-butyllithium at −78°C.