Abstract
A highly efficient and simple procedure for the synthesis of 4H‐benzo[b]pyrane derivatives is described. The reaction of 5,5‐dimethylcyclohexane‐1,3‐dione or cyclohexane‐1,3‐dione with aromatic aldehydes and malononitrile using catalytic amount of alumina supported KF in reflux ethanol affords the title compounds in high to excellent yields and in short reaction times.
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