Abstract
Several types of solid acid catalysts which can be applicable to liquid-phase organic reactions in polar reaction media have recently been developed to replace the conventional problematic homogeneous acids such as aluminum chloride and sulfuric acid. The present paper describes acidic salts of heteropolyacid and their modifications with silica as active insoluble solid acid catalysts for liquid-phase Friedel-Crafts reactions and hydrolysis of ethyl acetate. Silica-included heteropolyacid salts newly developed were readily separable from water and polar organic media, although the non-modified heteropolyacid salts formed colloidal solutions with polar solvents.
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