Methoxymethylene(triphenyl)phosphorane from alkyllithium reagents
摘要:
Whereas Li(t-Bu) is an efficient base for the generation of Ph3PCHOMe, Li(n-Bu) gives both this ylide and a butylidene ylide which is consistent with a Ph2(MeOCH2)PCH(n-Pr) formulation. P-31 NMR studies and their reactions with acylsilanes are described.