An Expeditious and Solvent-Free Synthesis of Substituted Pyrroles Using Sulfated Anatase-Titania as a Solid Acid Catalyst

K Ravi, B Krishnakumar, M Swaminathan

Index: Ravi, Krishnaswamy; Krishnakumar, Balu; Swaminathan, Meenakshisundaram Bulletin of the Chemical Society of Japan, 2013 , vol. 86, # 3 p. 370 - 375

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Abstract

Sulfated anatase-titania (TiO 2–SO 4 2−) has been used as a solid acid catalyst for the synthesis of substituted pyrroles from γ-diketone and aromatic/aliphatic (acyclic and cyclic) primary amines by simple physical grinding. This sulfated titania gives an excellent yield with less reaction time and is an inexpensive, easily recyclable nanocatalytic material for this reaction. Higher catalytic activity of TiO 2–SO 4 2− is due to its increased Brønsted acidity.