Nanosilica-anchored Pd(II)-Schiff base complex as efficient heterogeneous catalyst for activation of aryl halides in Suzuki-Miyaura cross-coupling reaction in water

摘要

A nanosilica (derived from rice husk)-anchored Pd(II)-Schiff base complex has been synthesized and characterized. This immobilized complex has been found to be a very effective and recyclable heterogeneous catalyst for the Suzuki-Miyaura cross-coupling reaction of various aryl halides with arylboronic acid in aqueous medium under mild conditions. The products were identified using H-1 NMR and mass spectral studies. This complex can be easily filtered out from the reaction medium and reused up to six times without significant loss of catalytic activity. Since the reaction proceeds under mild conditions in aqueous medium as well as the catalyst being recyclable, it provides an environmentally benign alternative route to the existing protocols for the Suzuki-Miyaura reaction.