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A simple and efficient method has been developed for Knoevenagel condensation between aldehydes or ketones and active methylene group by stirring in methylene chloride at 60 °C under heterogeneous conditions using silica supported ammonium acetate. The products are obtained in excellent yields and are in a state of high purity. The structures of the products were confirmed by IR, 1 H NMR and mass spectral data and comparison with authentic samples available commercially.

bulletin of the korean chemical society

Silica Supported Ammonium Acetate: An Efficient and Recyclable Heterogeneous Catalyst for Knoevenagel Condensation between Adehydes or Ketones and Active Methylene Group in Liquid Phase