Intramolecular Cyclizations via Carbenoid Intermediates in Complexation of Alkynyltungsten Compounds with Co2(CO)8:  A New Route to the Pauson−Khand Reaction

Intramolecular Cyclizations via Carbenoid Intermediates in Complexation of Alkynyltungsten Compounds with Co2(CO)8:  A New Route to the Pauson−Khand Reaction