Tungsten Wittig reagents: an efficient synthesis of α-functionalised tri- and tetrasubstituted alkenes

Abstract

The reaction of tungsten alkylidene complexes of the type W(CR¹R²)X₂Y₂ with organic carbonyl groups is shown to enable a variety of di-, tri-, and tetra-substituted alkenes to be synthesised directly, including enol ethers and enamines.