Abstract
A simpler and greener protocol has been developed for the preparation of aryl‐14H‐dibenzo[a.j]xanthenes: a one‐pot condensation of β‐naphthol and aryl aldehydes, in the presence of silica‐supported sodium hydrogen sulfate (NaHSO4 · SiO2) or tungstated zirconia (5%WO3/ZrO2) as heterogeneous catalysts in a solvent‐free media. The present methodology offers several advantages such as excellent yields, simple procedure, short reaction times (2–8 h), and milder conditions.
Acknowledgments
The authors are thankful to M. Hari Babu, head, Organic Chemistry Division II, IICT, for helpful discussions, and B.S.R. thanks CSIR, New Delhi, for financial assistance.