Journal of Chemical Technology and Biotechnology, Vol.79, No.11, 1275-1278, 2004
An efficient and environmentally friendly method for synthesis of arylmethylenemalononitrile catalyzed by montmorillonite K10-ZnCl2 under ultrasound irradiation
Montmorillonite K10-supported ZnCl2 is an efficient and environmentally friendly catalyst. Knoevenagel condensation of malononitrile with aromatic aldehydes catalyzed by K10-ZnCl2 in anhydrous ethanol produces arylmethylenemalononitriles in 87-98% yield within 2-10min under ultrasound irradiation. The catalyst can be reused two times without significant decrease in activity. (C) 2004 Society of Chemical Industry.
Keywords:arylmethylenemalononitriles;synthesis;Knoevenagel condensation;ultrasound irradiation;supported catalyst