| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 51390 | Catalysis Communications | 2009 | 4 Pages |
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
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Majid M. Heravi, Samaheh Sadjadi, Negar Mokhtari Haj, Hossein A. Oskooie, Fatemeh F. Bamoharram,