Generation of Tertiary Phosphine-Coordinated Pd(0) Species from Pd(OAc)2 in the Catalytic Heck Reaction

Article abstract of DOI:10.1246/cl.1992.2177

Palladium(II) diacetate reacted with water (1 equiv./Pd) and (R)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl ((R)-BINAP) (3 equiv./Pd) in benzene in the presence of Et3N to give the palladium(0) species Pd<(R)-BINAP>2 (1 equiv./Pd), (R)-BINAP monoxide (1 equiv./Pd), and Et3N*HOAc (2 equiv./Pd).The progress of reaction strongly affected by the content of water in the reaction solution.The reduction of Pd(OAc)2 in the presence of PPh3 proceeded in a similar process to give Pd(PPh3)4 and OPPh3.