Oxidative Addition of HP(O)Ph2 to Platinum(0) and Palladium(0) Complexes and Palladium-Catalyzed Regio- and Stereoselective Hydrophosphinylation of Alkynes

Oxidative addition of Ph 2 P(O)H to M(PEt 3 ) 3 (M = Pd, Pt) readily took place at room temperature in benzene to afford cis -MH[P(O)Ph 2 ][PPh 2 (OH)](PEt 3 ) complexes. The structure of the platinum complex was determined by X-ray crystallography. The palladium complex was found to undergo an insertion reaction with oct-1-yne to give 1- and 2-(diphenylphosphinyl)oct-1-enes. Pd(PPh 3 ) 4 catalyzed regio- and stereoselective synthesis of alkenyldiphenylphosphine oxides (hydrophosphinylation) from alkynes and Ph 2 P(O)H.