Efficient Synthesis of Aryl‐14H‐dibenzo[a.j]xanthenes using NaHSO₄‐SiO₂ or 5%WO₃/ZrO₂ as Heterogeneous Catalysts under Conventional Heating in a Solvent‐Free Media

Lingaiah Nagarapu Organic Chemistry Division II, Indian Institute of Chemical Technology, Hyderabad, IndiaCorrespondence[email protected]

M. Baseeruddin Organic Chemistry Division II, Indian Institute of Chemical Technology, Hyderabad, India

N. Vijaya Kumari Organic Chemistry Division II, Indian Institute of Chemical Technology, Hyderabad, India

Srinivas Kantevari Organic Chemistry Division II, Indian Institute of Chemical Technology, Hyderabad, India

A. P. Rudradas Organic Chemistry Division II, Indian Institute of Chemical Technology, Hyderabad, India

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.

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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.

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Efficient Synthesis of Aryl‐14H‐dibenzo[a.j]xanthenes using NaHSO₄‐SiO₂ or 5%WO₃/ZrO₂ as Heterogeneous Catalysts under Conventional Heating in a Solvent‐Free Media

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Efficient Synthesis of Aryl‐14H‐dibenzo[a.j]xanthenes using NaHSO4‐SiO2 or 5%WO3/ZrO2 as Heterogeneous Catalysts under Conventional Heating in a Solvent‐Free Media

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Efficient Synthesis of Aryl‐14H‐dibenzo[a.j]xanthenes using NaHSO₄‐SiO₂ or 5%WO₃/ZrO₂ as Heterogeneous Catalysts under Conventional Heating in a Solvent‐Free Media