Alkyne Cleavage as a Novel Route to Low‐Valent Carbyne‐Metal Complexes

Reversal of a carbine–isocyanide coupling al‐lowed synthesis of the electron‐rich carbyne complex 1. The key step in this new synthesis is the base‐induced cleavage of the tBu(H)NC;CPh ligand of a W^II complex to give a carbyne ligand and an isocyanide ligand. This method appears to be applicable to complexes having iscelectronic metal centers. (Figure Presented.)