Preparation and reactivity of a macroporous polymer-supported organotin hydride catalyst

摘要

Macroporous beads bearing organotin moieties have been synthesized by suspension copolymerization of a convenient organotin monomer with styrene and a crosslinking agent in the presence of a porogen. The influence of the nature and amount of the crosslinking agent on the properties of the resulting materials are discussed in terms of their permanent porosity, their swelling in solvents and their average pore diameter. The catalytic activity of the polymer-supported organotin chloride obtained has been tested in the reduction of 1-bromoadamantane by the sodium tetrahydroborate. The results are comparable with those observed with soluble tributyltin hydride. The good stability of the grafted tin functionality was demonstrated by performing several successive batches with constant activity without the need of a regeneration step. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 48]