Cation-exchanged montmorillonite clays as Lewis acid catalysts in the Fries rearrangement of phenyl toluene-p-sulphonate
Abstract
Cation-exchanged montmorillonite clays catalyse the Fries rearrangement of phenyl toluene-p-sulphonate to give selectively 2- and 4-hydroxyphenyl p-tolyl sulphones as major and minor products respectively.