Flavanoids. Part 6. The kinetics and mechanism of base-catalysed isomerisation of 3-arylideneflavanones
作者:Dilip Dattatraya Dhavale、Poonam Joshi、Keshav Gangadhar Marathe
DOI:10.1039/p29870000449
日期:——
Base-catalysed Z→E conversion of 3-arylideneflavanones provide a unique system suitable for kinetic studies by 1H n.m.r. spectroscopy. Isomerisation studies of 10 enones in [2H5] pyridine showed that a first-order unimolecular reaction was taking place. The Hammett σ–ρ relationship is not adequate to accommodate the substituent effect on rate in the case of p- and m-nitro-3-benzylidene derivatives
3-芳基黄烷酮的碱催化Z → E转化提供了一个适用于1 H nmr光谱动力学研究的独特系统。在[ 2 H 5 ]吡啶中对10个烯酮进行异构化研究表明,正在发生一阶单分子反应。哈米特σ-ρ关系不足以适应的情况下,上速率的取代基影响p -和米硝基-3-亚苄基衍生物。讨论了硝基取代基的异常情况。