Why is bentonite clay considered a novel base heterogeneous catalyst in Knoevenagel Condensation?

Label:chem

Topic
To develop modified bentonite clay as an alternative to hazardous base catalysts like pyridine and piperidine in Knoevenagel condensation.
Answer
Facilely available and cost-efficient bentonite clay was physically purified and chemically modified to investigate its catalytic activity in the heterogeneous catalysis of Knoevenagel condensation of aromatic aldehydes with ethyl cyanoacetate.
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