Versatility of phospha-alkynes as ligands.

What is it about?

Phosphaalkynes, RCP (R = But, Adamantyl), add across the RhRh double bond of [Rh2Cpequation/tex2gif-stack-1.gif(CO)2] to give either [Rh2Cpequation/tex2gif-stack-2.gif(μ‐CO)(COPCR)] or [Rh2Cpequation/tex2gif-stack-3.gif(CO){PCRC(O)CRP}] depending on the stoichiometry of the reaction (Cp* = η5‐C5Me5). The structures of these complexes have been elucidated by NMR spectroscopy and by a single crystal X‐ray study on [Rh2Cpequation/tex2gif-stack-4.gif(CO){PCAdC(O)CPAd}]. Small amounts of the 1,3‐diphosphacyclobutadiene complexes [RhCp*(P2C2R2)] and the trinuclear compound [Rh3Cpequation/tex2gif-stack-5.gif(CO)2] are also formed in these reactions. The reactions of RCP with [CoRhCp2*(CO)2] are also described.

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