Synthesis, characterization, and catalytic properties of diphenyl- and dichlorobutyltin functionalities grafted to insoluble polystyrene beads by a -(CH2)(n)- (n=4, 6) spacer

Insoluble diorganotin functionalized polymers of the type (P-H)(1-t)(P-(CH2 )(n)SnBuX2)(t), with n = 4, 6, X = Ph, Cl, and t being the degree of functi onalization, were synthesized from Amberlite XE-305, an insoluble polystyre ne (P-H) cross-linked with divinylbenzene. The synthesis conditions used ga ve rise to functionalization degrees varying from 25% to 30%. The tin-funct ionalized polystyrenes were characterized by elemental analysis, IR, and Ra man as well as solid-state Sn-117 and C-13 NMR spectroscopy. Methodological and chemical features related to the determination of the functionalizatio n degree have been investigated in detail. The catalytic activity of the Am berlite-grafted tin functionalities in transesterification reactions was st udied.