Tungstophosphoric Acid Supported on Silica Gel (H(3)PW(12)O(40)/SiO(2)) as an Eco-Friendly, Reusable and Heterogeneous Catalyst for the Synthesis of Pyrroles in Solution or under Solvent-Free Microwave Irradiation

摘要

Heteropoly acid supported on silica gel (H(3)PW(12)O(40)/SiO(2)) is easily used as a heterogonous, reusable and efficient catalyst for the synthesis of N-substituted, 2- and 3-unsubstituted pyrroles in solution or under solvent-free microwave irradiation. The catalyst can be easily recovered and reused for several times without loss of activity.