Tetrahedron

Nitrile∁ ketenimine tautomerism in substituted alkylidene malononitriles and alkylidene cyanoacetates: A characteristic UV absorption band

TR Kasturi, VK Sharma, A Srinivasan…

Index: Kasturi,T.R. et al. Tetrahedron, 1973 , vol. 29, p. 4103 - 4109

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Citation Number: 20

Abstract

Several alkylidene malononitriles (1b, 1d, 1e, 2b and4b) and alkylidene cyanoacetates (1a, 2a and4a) studied exhibit a long wavelength UV absorption band around 355 nm which shows a hyperchromic effect in the presence of ethanolic alkali. This band has been assigned to the ketenimine tautomer (5). Addition of water to1b, 1e and2b gives the corresponding pyridine diols (7a, 7b and8a) respectively. Similarly, addition of ethanol ...