An efficient recyclable polymer-supported bis-quaternary onium phase-transfer catalyst for the synthesis of dihalocyclopropyl derivatives at low alkaline concentration-comparative kinetic aspects

摘要

In this work, a new polystyrene-bound bis-onium phase-transfer catalyst was synthesized, and their catalytic activities were investigated in the synthesis of dichlorocyclopropyl derivatives of olefins. The new polymer-anchored multi-site phase-transfer catalyst showed significant high catalytic activity as compared to single-site phase-transfer catalyst. The comparative kinetic investigation reveals that the dichlorocyclopropanation of 1-methyl-4-vinyl benzene is faster than styrene in the presence of the new catalyst. This catalyst can be used several times with consistent catalytic activity. Experimental observations support an interfacial-type mechanism. Furthermore, its catalytic utility was examined in alkylation reactions.