Derivatives of arylhydrazonic acids. Part 3: Stereochemical rearrangement of Z-oxanilo-N1-dialkyl-N2-arylamidrazones
作者:Petra Frohberg、Christoph Wagner、Rene Meier、Wolfgang Sippl
DOI:10.1016/j.tet.2006.04.001
日期:2006.6
Relative stabilities of Z- and E-isomers, calculated with the RHF/6-31G∗ ab initio method, range between 0.7 and 2.1 kcal/mol. The Z-isomer is detected to be thermodynamically more stable for studied compounds. X-ray structure determination of 2-dimethylamino-N-phenyl-2-phenylhydrazonoacetamide revealed E- and Z-isomers (ratio 1:1) in the crystal. The different intra- and intermolecular hydrogen bond
通过亲核取代适当的酰氯的氯官能团已经制备了草酰-N 1-二烷基-N 2-芳基氨基dra 。Z-和E-异构体的相对稳定性(通过RHF / 6-31G *从头算)计算,范围为0.7至2.1 kcal / mol。所述ž检测异构体成为研究的化合物热力学上更稳定。X-射线结构测定2-二甲基氨基-N-苯基-2-苯基肼基乙酰胺显示E-和Z-晶体中的异构体(比率1:1)。在化合物的固态中识别出的不同的分子内和分子间氢键相互作用被溶解在极性溶剂中。发现所有化合物在溶液中形成E / Z-平衡。在某些情况下,可以分离E-异构体并对其进行充分表征。