New Chiral Complexes of Palladium(0) Containing P,S- and P,P-Bidentate Ligands

Abstract

New chiral complexes of Pd(0) containing either the bis(phosphine) (6,6‘-dimethoxybiphenyl-2,2‘-diyl)bis(3,5-di- tert -butylphenylphosphine) (MeO-BIPHEP, 1) or the phosphine−sulfur chelate (2,3,4,6-tetra- O -acetyl-1-{(2-diphenylphosphino)benzyl)thio}-β- d -glucopyranose ((2-Ph 2 PC 6 H 4 CH 2 )−S−CHCH(OAc)CH(OAc)CH(OAc)CH(CH 2 OAc)O, 2 ) have been prepared, and the solid-state structure of one of these, Pd(benzoquinone)( 2 ), has been determined. These Pd(0) complexes reveal interesting solution dynamics, as shown by 2-dimensional exchange spectroscopy. For the MeO-BIPHEP derivatives, one can obtain useful structural insights based on the observed restricted rotation around the aryl(3,5-di- tert -butylphenyl) P−C bonds.