Abstract
The transesterification of anthranilates with both mixtures of cis and trans and pure trans 3,3,5-trimethyl cyclohexanol was studied using ‘calcium-oxide- and magnesium-oxide’-based catalysts under ‘solvent-free’ conditions. The catalysts were characterized by XRD, CO2-TPD, BET-surface area, and FEG–SEM analysis. Pure calcium oxide was found to be the most effective heterogeneous catalyst. Pure ‘calcium-oxide’-based catalyst was recycled five times without appreciable loss in the catalytic activity. The TOF after five recycles was 10.7 mol/mol of catalyst/h. The study was further extended for the synthesis of new anthranilates. The synthesized pure esters have been characterized by UV–Vis, IR-, 1H NMR-, and 13C NMR spectroscopies and mass spectrometry.
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Acknowledgements
The authors are thankful to the Indian Institute of technology, Mumbai, for the support provided for the FT-IR, 13C NMR, 1H NMR, TPD, Mass, Elemental, and Image analyses.
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Thatte, C.S., Rathnam, M.V., Namdeo, A. et al. Heterogeneous catalytic solvent-free synthesis of 3,3,5-trimethyl cyclohexyl anthranilic acid esters via transesterification. Chem. Pap. 71, 981–990 (2017). https://doi.org/10.1007/s11696-016-0061-z
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DOI: https://doi.org/10.1007/s11696-016-0061-z