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

Bahador      Karami; Masih      Jamshidi; Saeed      Khodabakhshi

doi:10.2174/1570178611310010005

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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Letters in Organic Chemistry

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

Volume: 10 Issue: 1

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

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

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.

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Karami Bahador, Jamshidi Masih and Khodabakhshi Saeed, Modified Paal-Knorr Synthesis of Novel and Known Pyrroles Using Tungstate Sulfuric Acid as a Recyclable Catalyst, Letters in Organic Chemistry 2013; 10 (1) . https://dx.doi.org/10.2174/1570178611310010005