Abstract
A new chitosan-based Schiff base was prepared and complexed with manganese, cobalt and copper. These Schiff base metal complexes were used as heterogeneous catalysts for the air oxidation of β-isophorone to ketoisophorone. The obtained complexes were characterized by means of FT-IR,1HNMR spectroscopy, elemental analysis, powder X-ray diffraction, field emission gun scanning electron microscopy, electron spin resonance spectroscopy, ICP-AES and solubility tests. Thermal properties were also investigated using thermal gravimetric analysis. Data obtained by thermal analysis revealed that these complexes showed good thermal stability. The conversion and selectivity of β-isophorone to ketoisophorone for each prepared catalyst was studied using a batch reactor and gas chromatography for product identification and quantification. The results were compared against the homogeneous bis-salicylaldehyde ethylenedi-imine-Mn catalyst. The use of methanol, acetone, methyl isobutyl ketone and n-hexane as solvent and its effect on conversion and selectivity was also investigated. Acetone was found to be a promising solvent for the β-isophorone oxidation. The role of triethyl amine and acetyl acetone in the oxidation reaction has also been investigated.
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Notes
Oven, 100°C–45°C/min-280°C – 2min hold., Inlet, 250°C, Detector, 300°, split ratio, 1:500, sample injection, 0.2 μl.
Gas chromatograph combined with mass spectrometry.
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Acknowledgements
The authors thank Dr M K Pejavar, B N Bandodkar College of Science, Thane, India for providing the necessary infrastructure. The authors are also thankful to Dr P S Kumbhar and Dr A N Dixit, SI-Group (I) Ltd. for their valuable support during this research. Our thanks are also due to Dr R C Mhamane SI-Group (I) Ltd. and Dr Vinit Makwana, Reliance Industries Ltd for their helpful discussions during this research work.
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Spectroscopic characterization data are available as supporting information (figures S1–S11) in the Journal of Chemical Sciences website (www.ias.ac.in/chemsci).
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THATTE, C.S., RATHNAM, M.V. & PISE, A.C. Chitosan-based Schiff base-metal complexes (Mn, Cu, Co) as heterogeneous, new catalysts for the β-isophorone oxidation. J Chem Sci 126, 727–737 (2014). https://doi.org/10.1007/s12039-014-0601-4
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DOI: https://doi.org/10.1007/s12039-014-0601-4