Pd-zeolites as catalysts for the Heck reaction: a screening of reaction parameters affecting catalyst heterogeneity

摘要

Heck reactions were performed with 4-bromoacetophenone and n-butyl acrylate, yieldingthe trans-substituted acrylate ester with high selectivity. Pd-mordenite was used as catalyst.The heterogeneous nature of the catalysis largely depends on the solvent used and on the base.With tributylamine as the base and in toluene, the Pd(0)-mordenite catalyzed Heck olefinationis truly heterogeneous. The heterogeneous catalyst is less air-sensitive than typicalhomogeneous palladium catalysts that contain phosphine ligands.