Facile carbon–carbon bond formation on a triosmium cluster: crystal structures of [Os3(CO)8{C(Me)C(Me)C(O)C(Me)C(Me)C(Ph)C(Ph)}] and [Os3(CO)8{P(OMe)3}{C(Me)C(Me)C(O)C(Me)C(Me)}]

Abstract

The organometallic cluster [Os₃(CO)₈(NCMe){C(Me)C(Me)C(O)C(Me)C(Me)}] reacts with a range of alkynes to produce [Os₃(CO)₈{C(Me)C(Me)C(O)C(Me)C(Me)C(R)C(R′)}](R = R′= H, Me, or Ph; R = Me, R′= Ph) in which the incoming alkyne molecule and the previously co-ordinated pentadienone ligand have combined to produce a C₇Os₃ unit; the molecular structures of [Os₃(CO)₈{C(Me)C(Me)C(O)C(Me)C(Me)C(Ph)C(Ph)}] and [Os₃(CO)₈{P(OMe)₃}{C(Me)-C(Me)C(O)C(Me)C(Me)}] have been ascertained by X-ray analyses.