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The cluster compound [(p-H)Ir4(CO),(Ph2PCCPh)(p-PPh2)] 1 reacts with the phosphaalkyne ButCP to yield [Ir4(p-CO)(CO),{p~-113-Ph2PC(H)C(Ph)PCBut}(p-PPh2)] 3, containing the novel 2-phosphabutadienylphosphine fragment as a result of the coupling of ButCP with the diphenylphosphinoalkyne ligand and incorporation of the cluster bound H atom.

The phosphaalkyne complex [Pt(dppe)(h 2 -Bu t C•P)] undergoes ready hydrozirconation with [ZrHCl(h 5 -C 5 H 5 ) 2 ] to give the metallaphosphaalkene complex [Pt(dppe){h 2 -Bu t CHNPZrCl(h 5 -C 5 H 5 ) 2 }] which is a useful precursor for the synthesis of h 2 -phosphaalkene complexes.

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