Potassium fluoride-clinoptilolite, which is prepared from commercially
available and cheap starting materials, was used as an efficient and recyclable catalyst
for Knoevenagel condensation of aromatic aldehydes with active methylene compounds
under ultrasound irradiation. Short reaction times, high yields of products, ease
of recovery and catalyst reusability make this new method economic and efficient.
Keywords: Condensation, KF-clinoptilolite, Knoevenagel, ultrasounds, zeolites.
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