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

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 presen...

Full description

Saved in:
Bibliographic Details
Published inCatalysis communications Vol. 10; no. 13; pp. 1643 - 1646
Main Authors Heravi, Majid M., Sadjadi, Samaheh, Haj, Negar Mokhtari, Oskooie, Hossein A., Bamoharram, Fatemeh F.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.07.2009
Subjects
Bis-coumarin
Dihydropyrano[3,2-c]chromene
Heteropolyacids
Recyclable catalyst
Heteropolyacids
Dihydropyrano[3,2-c]chromene
Recyclable catalyst
Bis-coumarin
Online AccessGet full text

Cover

More Information
Summary: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.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2009.04.031