Jjv. Eynde et al., ULTRASOUND-PROMOTED BENZYLATION OF ARENES IN THE PRESENCE OF ZINC-CHLORIDE MIXED WITH A K10 CLAY, Tetrahedron letters, 36(18), 1995, pp. 3133-3136
Using K10 clay-supported zinc chloride, Friedel-Crafts benzylations pr
oceed readily at room temperature. Significant improvements of the rat
es can be obtained when the reaction mixtures are sonicated.