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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 37, 2007 - Issue 15
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Original Articles

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
Pages 2519-2525 | Received 13 Dec 2006, Published online: 09 Aug 2007
 
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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.

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