REACTION OF 3,3-DIMETHYL-1-PHOSPHABUTYNE, (T)BUCP, WITH TRIRUTHENIUM DODECACARBONYL AND TRIOSMIUM DODECACARBONYL

Reaction of (t)Bu-C=P with [Ru-3(CO)(12)] or [Os-3(CO)(12)] afforded t he novel phosphinidene complexes [Ru-3(CO)(9){PC(CO)(t)Bu}(2)] 1 or [O s-3(CO)(9){PC(CO)(t)Bu}(2)] 2, respectively. A crystal structure analy sis re vealed a nido structure for both complexes in agreement with a contribution of four electrons to the cluster framework by each phosph inidene ligand. A minor product of the reaction with [Os-3(CO)(12)] is the complex Os-3(CO)(9){P(C(CO)(t)Bu)C((t)Bu)P(Os-3(CO)(11))}] 3, con sisting of two triosmium units Linked by a P-C-P framework resulting f rom coupling of phosphinidene and phospha-alkyne fragments. Complex 3 was also characterized by means of a crystal structure analysis.