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Current Green Chemistry
ISSN (Print): 2213-3461
ISSN (Online): 2213-347X
VOLUME: 1
ISSUE: 2
DOI: 10.2174/2213346101666131212005735      Price:  $58









Niobic Acid as a Recyclable Heterogeneous Catalyst for the Solvent-Free Synthesis of Substituted Benzimidazoles

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Author(s): Beatriz M. Vieira, Angelita M. Barcellos, Ricardo F. Schumacher, Eder J. Lenardao and Diego da Silva Alves
Pages 136-144 (9)
Abstract:
We describe here a simple method for the synthesis of several substituted benzimidazoles using niobic acid Nb2O5.5H2O as heterogeneous catalyst and under solvent-free conditions. This new protocol is general and a range of aromatic and aliphatic aldehydes were condensed with o-phenylenediamine furnishing the corresponding 1,2-disubstituted benzimidazoles selectively in good yields. The catalyst was reused up four times giving the respective products in good yields but with a little decreasing in the selectivity.
Keywords:
Aldehydes, atom-economic, benzimidazoles catalysis, condensation, green chemistry, heterogeneous, heterocycles, heterocycles, niobic acid, niobium, nitrogen compounds, phenylenediamine, solid catalyst.
Affiliation:
LASOL - CCQFA - Universidade Federal de Pelotas - UFPel - P.O. Box 354 - 96010-900, Pelotas, RS, Brazil.