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Letters in Organic Chemistry

Editor-in-Chief

ISSN (Print): 1570-1786
ISSN (Online): 1875-6255

Modified Paal-Knorr Synthesis of Novel and Known Pyrroles Using Tungstate Sulfuric Acid as a Recyclable Catalyst

Author(s): Bahador Karami, Masih Jamshidi and Saeed Khodabakhshi

Volume 10, Issue 1, 2013

Page: [12 - 16] Pages: 5

DOI: 10.2174/1570178611310010005

Price: $65

Abstract

Tungstate sulfuric acid (TSA) as a solid acid catalyst has been synthesized and used in Paal–Knorr synthesis of some novel and known pyrroles under solvent-free conditions. Catalyst loadings can be as low as 1 mol % to give high yields of the corresponding pyrroles at 60 °C. To make the catalyst, sodium tungstic reacted with chlorosulfonic acid in nhexane.

Keywords: Catalyst, Paal–Knorr, pyrroles, solid acid, solvent-free, tungstate sulfuric acid, byproducts, TSA, temperatures, molar ratio, 2, 5-hexadione


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