The mono- and diimine products from the condensation of 3-formyl-4-hydroxycoumarin and various diamines were synthesized. It was shown by 1H NMR and mass spectrometry that the obtained compounds in DMSO-d6 solution and in gas phase exist in the E- and Z-keto-enamine forms.
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Notes
The designations of the s-cis/s-trans isomers refer to the mutual arrangement of the N(10)–H bond and the C(2')–NH2 fragment of the phenyl ring.
The intensity was normalized against the signal of the H-5 proton (δ = 7.79-7.92 ppm, 2H).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1903-1915, December, 2012.
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Milevskii, B.G., Chibisova, T.A., Solov’eva, N.P. et al. Synthesis and structure of Schiff bases derived from 3-formyl-4-hydroxycoumarin and diamines. Chem Heterocycl Comp 48, 1781–1792 (2013). https://doi.org/10.1007/s10593-013-1209-1
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DOI: https://doi.org/10.1007/s10593-013-1209-1