Some complexes of platinum, palladium, nickel, and cobalt formed from (2-hydroxyphenyl)diphenylphosphine and (2-hydroxyphenyl)di-t-butylphosphine

Abstract

The new phosphines PPh₂(C₆,H₄,OH-2) and PBu^t₂(C₆H₄OH-2) are described. With K₂[PtCl₄] or Na₂[PdCl₄] PPh₂-(C₆H₄OH)(L) gives impure complexes [MCl₂L₂](M = Pt or Pd) which readily lose hydrogen chloride to give [M(OC₆H₄PPh₂)₂](the palladium complex as a hydrate). With Na[BH₄]. cis-[Pt(OC₆H₄PPh₂)₂] gives the hydride [PtH(OC₆H₄PPh₂)L], and with methyl-lithium the derivative [PtMe(OC₆H₄PPh₂)L]. With acetic anhydride the platinum hydride gives the acetyl complex [Pt(COMe)(OC₆H₄PPh₂){PPh₂(C₆H₄O₂CMe-2)}]. The phosphine PPh₂(C₆H₄OH-2) with [Pd₂(2-methylallyl)₂(O₂CMe)₂] gives [Pd(2-methylallyl)(O₂CMe)L]. The complexes [M(OC₆H₄PBu^t₂)₂](M = Pt, Pd, Ni, or Co) are readily prepared from PBu^t₂(C₆H₄OH-2)(L′). The nickel complex is green but changes reversibly to an orange form on heating. The complex [Pd(2-methylallyl)(O₂CMe)L′] has also been prepared and on heating gives the volatile and non-fluxional [Pd(2-methylallyl)(OC₆H₄PBu^t₂)]. Hydrogen-1, ¹³C, and ³¹P n.m.r. and i.r. data are given.