Synthesis and some oxidative-addition reactions of bis(tricyclohexylphosphine)platinum

Abstract

Treatment of bis(cyclo-octa-1,5-diene)platinum with 2 molar equivalents of tricyclohexylphosphine affords two-co-ordinate bis(tricyclohexylphosphine)platinum. The complex [Pt(PMeBu^t₂)₂] may be obtained in the same manner but is markedly less stable. Bis(tricyclohexylphosphine)platinum reacts with hydrogen to give trans-[PtH₂{P(C₆H₁₁)₃}₂] and with a series of compounds RH, containing active hydrogen, to afford hydrides trans-[PtH(R){P(C₆H_1l)₃}₂](R = C₆F₅, 1,3,5-C₆F₃H₂, 1,3-C₆F₂H₃, C₆F₅O, PhO, C₆F₅NH, and C₄H₄N). Tris(triethylphosphine)platinum is less reactive towards some of these substrates but with pentafluorobenzene yields trans-[PtH(C₆F₅)(PEt₃)₂]. Chlorobenzene and [Pt{P(C₆H₁₁)₃}₂] afford trans-[PtCl(Ph){P(C₆H₁₁)₃}₂].