Catalytic activity of Iron pillared montmorillonites for benzylation of benzene with benzyl chloride

Abstract

The development of cutting edge and cleaner processes is of topical interest to meet global competition and conform stringent environmental specifications. Friedel-Crafts alkylation is a very important tool for introducing alkyl substituents into the aromatic ring system. Conventionally, homogeneous acidic catalysts are used for the reaction. This presents several problems like tedious work up, use of corrossive chemicals, moisture sensitivity, decreased regioselectivity etc. The use of solid acids to replace waste generating soluble Lewis acids for the alkylation of arenes facilitates improved procedures. In this paper, we report the use of cleaner, shape selective iron pillared clay catalysts for Friedel-Crafts alkylations. Presence of surface acid sites as well as its nature influences the catalytic activity. A free radical mechanism has been suggested for the reaction.