Abstract
Natural Moroccan clay samples from different regions were purified via simple washing, activated and extensively analyzed by various characterization techniques. A comparative study of these clays as recyclable heterogeneous catalysts for the Knoevenagel condensation was undertaken in EtOH/water as solvent under mild conditions; high yield of the desired α,β-unsaturated products was obtained in a short reaction period (~ 30 min). The recyclable solid catalyst was effective for several runs indicating that these purified clays are potentially eco-friendly heterogeneous catalysts; assorted α,β-unsaturated carbonyl compounds were synthetized in high yields (~ 98%) at 40 °C.
Published Version
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