E/Z(C=C)-Isomerization of enamines of 3-formyl-4-hydroxycoumarin induced by organic solvents
作者:V. F. Traven、I. V. Ivanov、V. S. Lebedev、T. A. Chibisova、B. G. Milevskii、N. P. Solov’eva、V. I. Polshakov、G. G. Alexandrov、O. N. Kazheva、O. A. Dyachenko
DOI:10.1007/s11172-010-0284-z
日期:2010.8
According to 1? and 13? 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 ?/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
根据 1? 和 13?NMR 数据,3-甲酰基-4-羟基香豆素的烯胺以酮烯胺互变异构形式存在,并在室温下在 CDCl3、DMSO-d6 和 CD3OD 中围绕 C=C 键发生 Z/E 异构化。β/Z-异构化的活化能通过实验测量并通过B3LYP/6-311++G(d,p)方法计算。X 射线衍射研究表明,结晶状态的 3-(苄亚氨基甲基)色烷-2,4-二酮以两种酮烯胺异构体的混合物形式存在。