Predominance of 2-arylhydrazones of 1,3-diphenylpropane-1,2,3-trione over its proton-transfer products
作者:Ryszard Gawinecki、Erkki Kolehmainen、Henryk Janota、Reijo Kauppinen、Maija Nissinen、Borys O?mia?owski
DOI:10.1002/poc.435
日期:2001.11
substituent effect is transmitted effectively only to the hydrazone nitrogen and hydrogen atoms. Ab initio calculations show that the ketohydrazone tautomer is really very much favoured over its proton-transfer products in chloroform solution. The same tautomer was also detected in the crystal state by X-ray crystallography. Copyright © 2001 John Wiley & Sons, Ltd.
通过15 N NMR化学位移在氯仿溶液中检测到1,3-二苯基-1,2,3-三酮的2-苯hydr是主要的互变异构形式。苯hydr部分中的取代基不影响该互变异构偏好。取代基效应仅有效地传递至的氮和氢原子。从头算计算表明,酮hydr互变异构体确实比氯仿溶液中的质子转移产物更受青睐。还通过X射线晶体学在晶体状态下检测到相同的互变异构体。版权所有©2001 John Wiley&Sons,Ltd.