Ti^IV Complexes with Bridging Ylide Ligands: Double Oxophiles in Reactions with Aldehydes

Abstract

As compounds with characteristics of Wittig and Tebbe reagents, titanacycles 1 (X = Cl, NMe2) can function as synthetic equivalents of carbon atoms because of the oxophilicity of the P and Ti centers. In fact, complexes 1 react with electron-rich aromatic aldehydes (Ar = 4-MeC6H4, 4-MeOC6H4) to give the allenes 2.