An efficient synthesis of benzoxazoles using silica-supported tin exchanged silicotungstic acid catalyst

An efficient heterogeneous silica-supported tin exchanged silicotungstic acid catalyst is demonstrated for the synthesis of benzaxazoles by reaction of amonophenols with orthoesters under mild reaction conditions. An efficient method for the preparation of benzoxazoles by reacting aminophenols with...

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Bibliographic Details
Published in:Journal of molecular catalysis. A, Chemical Chemical, 2010-08, Vol.328 (1), p.119-123
Main Authors: Srivani, A., Venkateswar Rao, K.T., Sai Prasad, P.S., Lingaiah, N.
Format: Article
Language:English
Subjects:
Aminophenol
Benzoxazole
Catalysis
Chemistry
Exact sciences and technology
General and physical chemistry
Orthoesters
Silica
Silicotungstic acid
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Tin
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Summary:An efficient heterogeneous silica-supported tin exchanged silicotungstic acid catalyst is demonstrated for the synthesis of benzaxazoles by reaction of amonophenols with orthoesters under mild reaction conditions. An efficient method for the preparation of benzoxazoles by reacting aminophenols with orthoesters in the presence of silica-supported tin exchanged silicotungstic acid catalyst under mild conditions with high yield and selectivity is demonstrated. The catalysts were characterized by FT-IR and pyridine adsorbed FT-IR. The catalyst exhibited consistent activity upon recycling and is highly active compared to other catalysts. The role of Lewis acidity of the catalysts and plausible reaction mechanism is presented.
ISSN:1381-1169
1873-314X
DOI:10.1016/j.molcata.2010.06.009