Synthesis of hydrido-bis(acetylide) complexes of rhodium and the molecular structures of mer-trans-[Rh(PMe ₃ ) ₃ (H)(CCPh) ₂ ] and mer-trans-[{Rh(dmpe)(H)(CCSiMe ₃ ) ₂ } ₂ (µ-dmpe)](dmpe = Me ₂ PCH ₂ CH ₂ PMe ₂ )

Complexes of the form mer-trans-[Rh(PMe3)3(H)(CCR)2] and mer-trans-[{Rh(dmpe)(H)(CCR)2}2(µ-dmpe)] have been prepared by oxidative addition of HCCR to [Rh(PMe3)4(CCR)] and [Rh(dmpe)2Me] species, respectively; the molecular structures of mer-trans-[Rh(PMe3)3(H)(CCPh)2] and mer-trans-[{Rh(dmpe)(H)(CCSiMe3)2}2(µ-dmpe)](dmpe = Me2PCH2CH2PMe2) have been determined by single crystal X-ray diffraction studies.