Novel diphosphine-modified palladium catalysts for oxidative carbonylation of styrene to methyl cinnamate

摘要

The oxidative carbonylation of styrene has been achieved in MeOH with known and new palladium(II) catalysts of general formulae [Pd(P-P)(MeCN)_2][PF_6]_2, [Pd(P-P)(bipy)][PF_6]_2,Pd(P-P)(OAc)_2, [Pd_2(cyclo-tetraphos)(MeCN)_4][PF_6]_4, [Pd_2(cyclo-tetraphos)(bipy)_2][PF_6]_4, Pd_2(cyclo-tetraphos)(OAc)_4 (P-P = 1,2-bis(diphenylphosphino)ethane), meso-2,3-bis(diphenylphosino)butane or rac-2,3-bis(diphenylphosino)butane; cyclo-tetraphos = cis, trans, cis-1,2,3,4-tetrakis(diphenylphosphino)cyclobutane; bipy = 2,2'-bipyridine; OAc = acetate).