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Ionic liquid coated sulfonated carbon@titania composites for the one-pot synthesis of indeno[1,2-b]indole-9,10-diones and 1H-pyrazolo[1,2-b]phthalazine-5,10-diones in aqueous media

Abstract

A highly active and stable ionic liquid based novel solid Bronsted acid catalysts (C@TiO2-SO3H-ILs) have been prepared by coating a long chain ionic liquid onto sulfonated carbon@titania composites. The ionic liquid coating resulted in efficient stability and activity of C@TiO2-SO3H-ILs in aqueous conditions by creating hydrophobic environment on the catalyst surface. The catalytic activity of the newly designed catalysts was tested in the one-pot multicomponent synthesis of indeno[1,2-b]indole-9,10-diones and 1H-pyrazolo[1,2-b]phthalazine-5,10-diones in aqueous media. The structure of most active catalyst, C@TiO2-SO3H-IL1 before and after the coating with ionic liquid was investigated by FTIR, TGA, XRD, CHNS, EDX, SEM and HRTEM. The catalyst allows easy recovery and excellent reusability upto five catalytic runs without considerable loss of activity

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Publication details

The article was received on 30 Jan 2017, accepted on 16 May 2017 and first published on 17 May 2017


Article type: Paper
DOI: 10.1039/C7NJ00361G
Citation: New J. Chem., 2017, Accepted Manuscript
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    Ionic liquid coated sulfonated carbon@titania composites for the one-pot synthesis of indeno[1,2-b]indole-9,10-diones and 1H-pyrazolo[1,2-b]phthalazine-5,10-diones in aqueous media

    M. Kour, M. Bhardwaj, H. Sharma, S. Paul and J. Clark, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00361G

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