REACTIONS OF CYCLOPALLADATED COMPOUNDS AND ALKYNES - NEW PATHWAYS FOR ORGANIC-SYNTHESIS

Cyclometallated compounds, obtained by direct intramolecular C-H activation of a ligand by transition metals, are fairly reactive [especially those derived from palladium(II)] towards insertion of internal alkynes into their metal-carbon bond. This reaction leads to either new organometallic compounds by inclusion of one to three alkynes into the M-C bond, or organic compounds which are either carbocyclic or heterocyclic, their nature depending upon the alkyne substituents as well as upon the cyclometallated ligand.