E/Z(C=C)-Isomerization of enamines of 3-formyl-4-hydroxycoumarin induced by organic solventsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:According to 1H and 13C NMR data, enamines of 3-formyl-4-hydroxycoumarin exist in the keto enamine tautomeric form and undergo Z/E-isomerization around the C=C bond in CDCl3, DMSO-d6, and CD3OD at room temperature. The activation energies of E/Z-isomerization were measured experimentally and calculated by the B3LYP/6-311++G(d,p) method. An X-ray diffraction study showed that 3-(benzyliminomethyl)chromane-2,4-dione in the crystalline state exists as a mixture of two keto enamine isomers.