SCHEDULED MAINTENANCE
Reaction of 2-hydroxy- or 2-methoxy-substituted benzaldehydes or acetophenones with Meldrum’s acid in the presence of environmentally-friendly catalysts, like natural kaolinitic clays, EPZ10 and EPZG, without solvent using focused microwaves afforded 3-carboxycoumarins in excellent yields.
B. P. Bandgar, L. S. Uppalla and D. S. Kurule, Green Chem., 1999, 1, 243 DOI: 10.1039/A905811G
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