An Alkylidyne Analogue of Tebbe's Reagent:Trapping Reactions of a Titanium Neopentylidyne by Incomplete and Complete 1,2-Additions

摘要

Methylenation of carbonyl-containing functionalities has driven the research of organotitanium reagents for use in organic chemistry.Tebbe's reagent,[Cp2Ti{CH2AlCl-(CH3)2}](Cp = C5H5),a Lewis acid stabilized methylidene complex prepared from addition of two equivalents of Al(CH3)3 to [Cp2TiCl2] [Eq.(1)],was one of the first reported early-transition-metal systems to perform olefin metathesis in