INFLUENCE OF THE AROMATIC POLYMERIC MATRIX TYPE ON STABILITY OF NANOSIZED PALLADIUM CATALYSTS IN SUZUKI REACTION

• Main Authors: E.S. Bakhvalova, A.V. Bykov, A.I. Sidorov, L.Zh. Nikoshvili, L. Kiwi-Minsker
• Format: Article
• Language: Russian
• Published: Tver State University 2020-12-01
• Series: Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов
• Subjects: suzuki cross-coupling; palladium; catalyst; nanoparticles; hyper-crosslinked polystyrene
• Online Access: https://physchemaspects.ru/2020/doi-10-26456-pcascnn-2020-12-775/

This work is devoted to the study of the influence of the type of polymeric matrix of hyper-crosslinked polystyrene on activity and stability of palladium catalysts of Suzuki cross-coupling. The use of the hyper-crosslinked polystyrene functionalized with tertiary amino groups was shown to be promising in terms of ensuring of the catalyst stability during recycles, but in order to achieve 100 % conversion of aryl halide ( 4 - bromanisole) the use of strong excess of phenylboronic acid and of a base is required. The catalyst based on non-functionalized hyper-crosslinked polystyrene had higher activity and allowed achieving complete conversion of 4 - bromanisole during the reaction under mild conditions ( 70°С, ethanol and water mixture is in the ratio of 5:1 as a solvent) while using 1,5 - fold excess of phenylboronic acid. However, strong adsorption of the cross-coupling product in a hydrophobic polymeric matrix was found to be a disadvantage of such a system.