Abstract
The present work aims to fabricate ultrasonic assisted microencapsulation of zinc triflate based on polyethersulfone (PES) as an efficient regioselective catalyst for Friedel-Crafts acylation.
The catalyst was reused for consequent reactions. Ultrasound displayed an important role on selectivity for Friedel-Crafts acylation reaction due to the controlled release of Lewis acid in addition to its cavitational effect that decreases the reaction time and increases the yield of the reaction.
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•Microencapsulated Zn(OTf)2 in polyethersulfone as catalyst was sonochemically prepared.•Ultrasound displayed an important role on selectivity for Friedel-Crafts reaction.•The regioselectivity due to controlled release effect excreted by ultrasound.•The reactivity is not only as a result of kinetic energy but also, cavitation.•The catalyst is recovered by filtration and reused several times without loss of activity.