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Cyclometallated compounds obtained via the well-known intramolecular C-H activation by transition metals of N- or S- containing ligands may lead to organic heterocycles through reaction with alkynes. The mechanistic implications of the formation of both C-C and C-Y bonds are discussed. A reaction pathway involving insertion of the alkyne into the metal- carbon bond of the starting material followed by intramolecular addition of the Y atom to the resulting metallated-vinyl unit is proposed based on both the regioselectivity of the insertion and the existence of genuine isolated intermediates for the formation of the heterocyclic compounds.

Selected applications to organic synthesis of intramolecular C-H activation reactions by transition metals