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.
Chakrabarty, Manas; Mukherji, Ajanta, Journal of the Indian Chemical Society, 2013, vol. 90, # 10, p. 1681 - 1694
作者:Chakrabarty, Manas、Mukherji, Ajanta
DOI:——
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Campbell, Jack B.; Lavagnino, Edward R.; Ryan, Charles W., Organic Preparations and Procedures International, 1991, vol. 23, # 5, p. 660 - 665
作者:Campbell, Jack B.、Lavagnino, Edward R.、Ryan, Charles W.