Synthesis, characterization and catalytic evaluation in the Heck coupling reactions of S-P-S pincer complexes of the type [Pd{PhP(C6H4-2-S)(2)}(PAr3)]

摘要

A series of palladium complexes of the type [Pd(phPS(2))(PAr3)] (phPS(2)) = [PhP(C6H4-2-S)(2)](2-) have been synthesized in good yields and their crystal structures determined. Heck coupling reactions were carried out using the [Pd(phPS(2))(PPh3)] (1), [Pd(phPS(2)){P(C6H4-4-Cl)(3)}] (2), [Pd(phPS(2)) {P(C6H4-4-F)(3)}] (3), [Pd(phPS(2)) {P(C6H4-4-CF3)(3)}] (4), [Pd(phPS(2)){P(C6H4-4-Me)(3)}] (5) and [Pd(phPS(2)) {P(C6H4-4-OMe)(3)}] (6) complexes as catalyst precursors in order to examine the potential effect of the para-substituted triarylphosphines in the reaction of bromobenzene and styrene. (c) 2006 Elsevier B.V. All rights reserved.