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Issue 30, 2012
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Catalysis by FeF3 in water: a green synthesis of 2-substituted 1,3-benzazoles and 1,2-disubstituted benzimidazoles

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Abstract

FeF3 in water facilitated the reaction of 1,2-phenylenediamine and 2-aminothiophenol with 1 equivalent of an alkyl- or aryl-aldehyde leading to 1,3-benzazoles in open air. The process afforded 1,2-disubstituted benzimidazoles when 1,2-phenylenediamine was reacted with 2 equivalents of aryl aldehyde. The methodology is operationally simple, free from the use of hazardous organic solvents and chemoselective. The products were isolated by simple filtration and the catalyst can be recovered and recycled.

Graphical abstract: Catalysis by FeF3 in water: a green synthesis of 2-substituted 1,3-benzazoles and 1,2-disubstituted benzimidazoles

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Article information


Submitted
26 Sep 2012
Accepted
26 Sep 2012
First published
27 Sep 2012

RSC Adv., 2012,2, 11510-11519
Article type
Paper

Catalysis by FeF3 in water: a green synthesis of 2-substituted 1,3-benzazoles and 1,2-disubstituted benzimidazoles

T. Bhaskar Kumar, Ch. Sumanth, A. V. Dhanunjaya Rao, D. Kalita, M. Srinivasa Rao, K. B. Chandra Sekhar, K. Shiva Kumar and M. Pal, RSC Adv., 2012, 2, 11510
DOI: 10.1039/C2RA22302C

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