Journal
CARBOHYDRATE POLYMERS
Volume 92, Issue 2, Pages 2252-2256Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.12.010
Keywords
Heterogeneous organocatalyst; Salep; Natural polymer; High loaded catalysts; 4H-benzo[b]pyrans
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In this work, a novel heterogeneous organocatalyst was synthesized by immobilization of hydroxide ions on the modified salep as a natural polymer. Because of the grafting of ionic polymer chains onto the salep backbone, catalyst has high loading level of hydroxide ions (3.01 mmol/g). The resulting catalyst shows excellent activity in the synthesis of 4H-benzo[b]pyrans in water at room temperature in short reaction times. The present catalyst and protocol represent a simple, ecologically safe and cost-effective route to synthesize 4H-benzo[b]pyrans with high product yield, as well as easy catalyst recycling. (C) 2012 Elsevier Ltd. All rights reserved.
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