New catalytic systems based on intercalated polymermontmorillonite supports

A composite material was prepared by ion exchange between the ammonium salt of the alpha,omega-diamine-terminated oligo(butadiene-co-acrylonitrile) (A TBN) and the interlamellar cation of the montmorillonite (Na-MMT). Grafted free radical polymerization of both oligo(oxyethylene)methacrylate and chlo romethylstyrene supported onto the above composite was prepared. The chloro methyl groups were modified to produce onium salts which are suitable as ph ase transfer catalysts. The catalytic activities were investigated in nucle ophilic reactions of thiocyanate, cyanate and nitrite with alkyl or aryl ha lides. The effects of the nature and structure of the support, amount of ca talyst, solvent, and the temperature on the rate of reactions were studied.