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Role of various heteropolyacids in the reaction of 4-hydroxycoumarin, aldehydes and ethylcyanoacetate

Paper ID Volume ID Publish Year Pages File Format Full-Text
51390 46842 2009 4 PDF Available
Title
Role of various heteropolyacids in the reaction of 4-hydroxycoumarin, aldehydes and ethylcyanoacetate
Abstract

The effects of various heteropolyacids including Preyssler, Wells-Dawson and Keggin regarding the yields and types of products in the reaction of 4-hydroxycoumarin, aldehydes and ethylcyanoacetate have been investigated. The results show that dihydropyrano[3,2-c]chromenes were obtained in the presence of Preyssler and Wells-Dawson as the only products while in the presence of Keggins, this reaction led to formation of two compounds including bis-coumarins as major and dihydropyrano[3,2-c]chromenes as minor products.

Keywords
Bis-coumarin; Dihydropyrano[3,2-c]chromene; Heteropolyacids ; Recyclable catalyst
First Page Preview
Role of various heteropolyacids in the reaction of 4-hydroxycoumarin, aldehydes and ethylcyanoacetate
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 13, 25 July 2009, Pages 1643–1646
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis