The reaction of diphenylphosphine, PPh2H, with an alkyne-bridged dicobalt carbonyl complex; the synthesis crystal structure and reactivity of the complex (μ-PPh2)(CO)4>

Article abstract of DOI:10.1016/0022-328X(92)85029-V

The reaction between (CO)6> and diphenylphosphine gives the mono- and di-substituted complexes (CO)6-n(PPh2H)n> .Thermolysis of (1) leads to phosphorus-hydrogen bond cleavage and formation of the phosphido-, vinyl-bridged complex (μ-PPh2)(CO)4> (3) together with the trinuclear cobalt complex (μ-PPh2)(CO)7> (4).An X-ray diffraction study of 3 reveals that one of the methylcarboxylate substituents of the vinyl ligand is coordinated via oxygen to cobalt, forming an almost planar five-membered metallacyclic ring.The reactions of (3) with a tertiary phosphine and with phenylacetylene are described.