Answers are grounded in this paper and cite their sources.
Abstract 4 H ‐Benzo[ b ]pyrans was synthesized under reflux condition in ethanol via condensation of benzaldehyde, malononitrile and dimedone with ZnO‐beta zeolite as an inexpensive and effective catalyst. The key features of the reported protocols are good to excellent yields, short reaction time and recovery and reusability of catalytic material.
No takes yet. Share an insight, caveat, or question.
Katkar et al. (2011) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: