Hetero-Michael addition of benzenethiol to cycloalkenones using cation-exchanged faujasites: Simultaneous acid-base bifunctional catalysis

Effects of various cation-exchanged faujasite zeolites (with different Si/Al ratios) are studied in the thia-Michael addition of benzenethiol to cycloalkenones. Plausible mechanisms involving simultaneous participation of acidic/basic sites of zeolite is proposed, which is supported by IR data on enone/zeolite composites.