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Phosphorus, Sulfur, and Silicon and the Related Elements Volume 184, 2009 - Issue 12
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Original Articles

Ce(SO4)2·4H2O as a Recyclable Catalyst for an Efficient, Simple, and Clean Synthesis of 4H-Benzo[b]pyrans

Mohammad Reza Islami Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran
&
Elaheh Mosaddegh Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran
Pages 3134-3138 | Received 11 Jul 2008, Accepted 02 Dec 2008, Published online: 18 Nov 2009
 
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Abstract

An efficient method for the synthesis of 4H-benzo[b]pyrans has been developed by the use of Ce(SO4)2·4H2O (2.5 mol%) as a catalyst. Heating the mixture of an appropriate aldehyde, malononitrile, and dimedone in the presence of the catalyst at 45°C in a mixture of water:ethanol (1:1) as solvent for about 9–55 min resulted excellent yields of the corresponding products. Short experimental time of the reaction, excellent yields, simple workup, not using cumbersome apparatus for purification of the products, and inexpensiveness and commercially availability of the catalyst are the advantages of this method.

Notes

a Yields refer to the isolated products.

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