Vinylidene complexes in organic synthesis

Abstract

Application of vinylidene complexes in organic synthesis is discussed. Mechanism of formation from n2 alkyne cornplexes of transition metals, preparation from n2 alkyne, acetylide, carbene, carbyne or acyl complexes as well as the structure of the vinylidene complexes are outlined. Reactions of vinylidene complexes with electrophiles and nucleophiles are also detailed. In addition, catalytic reactions involving transition metal complexes for the synthesis of a variety of organic compounds and polymers from acetylenic compounds which invoke an in situ formation of vinylidene intermediates are discussed in detail.