PREPARATION AND REACTIVITY OF A MACROPOROUS POLYMER-SUPPORTED ORGANOTIN HYDRIDE CATALYST

Macroporous beads bearing organotin moieties have been synthesized by suspension copolymerization of a convenient organotin monomer with sty rene and a crosslinking agent in the presence of a porogen. The influe nce of the nature and amount of the crosslinking agent on the properti es of the resulting materials are discussed in terms of their permanen t porosity, their swelling in solvents and their average pore diameter . The catalytic activity of the polymer-supported organotin chloride o btained has been tested in the reduction of 1-bromoadamantane by the s odium tetrahydroborate. The results are comparable with those observed with soluble tributyltin hydride. The good stability of the grafted t in functionality was demonstrated by performing several successive bat ches with constant activity without the need of a regeneration step. ( C) 1998 Elsevier Science Ltd. All rights reserved.