In the hydration of cyclohexene, alkylchlorosilane-treated ZSM-5s, whi
ch floated at the interface of the two liquids, were observed to be so
lid interface catalysts in a decalin-water system. The catalysts, espe
cially cyclohexyl-immobilized H-ZSM-5, show their capacity of accelera
ting the hydration with suppression of the formation of by-products su
ch as dicyclohexyl ether.