Abstract
Ninhydrin reacted expeditiously with thirteen active methylene compounds on montmorillonite K10 clay at room temperature to furnish, in 5 min, a Knoevenagel condensate in one case, aldols in six cases, aldol-derived cyclic hemiketals in three cases, and interesting products in the remaining three cases. Almost identical results were obtained, but faster, when the reactions were carried out in water on steam-bath. The structures of two novel products were also confirmed by single-crystal X-ray diffraction analysis.
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Acknowledgments
We sincerely thank Professor S. Raha, Director, Bose Institute, for laboratory facilities, the C.S.I.R., Govt. of India for providing a fellowship (A.M.), Mr B. Majumder, NMR facilities, and Mr P. Dey, Microanalytical Laboratory, both of the Bose Institute, for recording the spectra.
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Chakrabarty, M., Mukherji, A., Arima, S. et al. Expeditious reaction of ninhydrin with active methylene compounds on montmorillonite K10 clay. Monatsh Chem 140, 189–197 (2009). https://doi.org/10.1007/s00706-008-0066-6
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DOI: https://doi.org/10.1007/s00706-008-0066-6