Abstract
Benzoylation of xylenes leads to different dimethyl benzophenone isomers which are important intermediates for a variety of industries including pharmaceuticals, fine chemicals, agrochemicals, explosives, polymers, antioxidants, etc. It is possible to prepare these ketones selectively and economically from commercial mixed xylenes under different sets of conditions because of the preferential reactivities of xylene isomers in the presence of solid acid catalysts. The regioselective benzoylation of pure xylene isomers and also of mixed xylenes was studied with benzoyl chloride over Cs2.5H0.5PW12O40 supported on K-10 montmorillonite clay as the catalyst. This is a novel catalyst, which could be reused without any further chemical treatment, eliminating the effluent disposal problems. This also forms the basis for the separation of individual xylene components.
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Acknowledgement
Funding for this research was made available from the BRNS Grant No. 98/37/4/BRNS Cell/724 under GDY. NSA thanks BRNS for award of JRF. GDY greatly acknowledges Darbari Seth Professorship Endowment and the hospitality of Michigan State University East Lansing as Johansen–Crosby Visiting Chair Professorship in Chemical Engineering during 2001–2002. SSS is grateful to UICT Golden Jubilee Fund for the financial assistance. Thanks are due to Dr V.S. Kamble of BARC for assistance in catalyst characterization. Part of this work was presented in the American Institute of Chemical Engineers Fall Meeting in Reno, Nevada, during 6–10 November 2001.
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Yadav, G.D., Asthana, N.S. & Salgaonkar, S.S. Regio-selective benzoylation of xylenes over caesium modified heteropolyacid supported on K-10 clay. Clean Techn Environ Policy 6, 105–113 (2004). https://doi.org/10.1007/s10098-003-0197-8
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DOI: https://doi.org/10.1007/s10098-003-0197-8