Abstract
It was demonstrated by x-ray diffraction analysis that 1-imino-5-methyl-3,5-diphenyl-2-cyclohexene-2,6,6-tricarbonitrile, which has been erroneously described in the literature as a 1-phenylethylidenemalononitrile dimer, actually has the 6-methyl-4,6-diphenyl-2-dicyanomethylene-1,2,5,6-tetrahydronicotinonitrile structure. The latter is one of three isomers that are formed as a result of the base-catalyzed dimerization of 1-phenylethylidenemalononitrile. The conformation of the unsaturated heteroring is discussed.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 71–74, January, 1988.
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Tafeenko, V.A., Abramenko, Y.T., Ivashchenko, A.V. et al. X-ray diffraction study of 6-methyl-4,6-diphenyl-2-dicyano-methylene-1,2,5,6-tetrahydronicotinonitrile. Chem Heterocycl Compd 24, 60–63 (1988). https://doi.org/10.1007/BF00475568
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DOI: https://doi.org/10.1007/BF00475568