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

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

Journal Name: Letters in Organic Chemistry

Volume 10 , Issue 1 , 2013

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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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Article Details

VOLUME: 10
ISSUE: 1
Year: 2013
Page: [12 - 16]
Pages: 5
DOI: 10.2174/1570178611310010005

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