Catalytic copolymerization of CO and ethylene with a charge neutral palladium(II) zwitterion

Connie C Lu; Jonas C Peters

doi:10.1021/ja017011s

Catalytic copolymerization of CO and ethylene with a charge neutral palladium(II) zwitterion

J Am Chem Soc. 2002 May 15;124(19):5272-3. doi: 10.1021/ja017011s.

Authors

Connie C Lu¹, Jonas C Peters

Affiliation

¹ Division of Chemistry and Chemical Engineering, Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, USA.

PMID: 11996560
DOI: 10.1021/ja017011s

Abstract

The synthesis of a zwitterionic Pd(II) complex supported by an anionic bis(phosphino)borate ligand, Ph(2)B(CH(2)PPh(2))(2) (abbreviated as [Ph(2)BP(2)]), is reported. The new complex, [Ph(2)BP(2)]PdMe(THF), is active for CO and ethylene copolymerization. The copolymerization activity and polyketone molecular weight for the neutral, zwitterionic system are compared with those for the cationic systems [R(2)E(CH(2)PPh(2))(2)PdMe(THF)][B(C(6)F(5))(4)] where ER(2) = SiPh(2) and CH(2). Surprisingly, the more electron rich zwitterionic system is a catalyst of activity comparable to that of the more conventional cationic systems.