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The effect of the specific surface area of natural phosphate on Michael condensations involving chalcone derivatives and various nucleophiles is reported. The catalytic activity is intimately connected to the specific surface area of the catalyst. The best activities were observed with the thermally treated micronised catalyst (NP m ).

Functionalized alkenes were successfully synthesized via a clean procedure in a short time by using a new recycled heterogeneous catalyst prepared from Moroccan oil shale, this catalyst is characterized by different technics such XRD, BET-BJH, MEB-EDS, and TGA, before it’s has been used in the Knoevenagel condensation between different aldehydes and active methylenes. The results showed that coupling the catalyst with ultrasound irradiations could improve the catalytic system in this transformation by achieving the products in a very short time, the results showed clearly that this catalyst could be considered as excellent recyclable support in Knoevenagel condensation.

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