Kinetics and mechanism of the cyclisation of some 2′-hydroxy-chalcone epoxides and subsequent elimination reactions of aurone hydrates
作者:Christopher J. Adams、Lyndsay Main
DOI:10.1016/s0040-4020(01)92283-5
日期:1992.11
Analysis of the pH-rate profile for the cyclisation of the monoanion of 2′-hydroxychalcone epoxide which gives 3-hydroxyflavanone and of some 6′-alkoxy-substituted analogues which give mostly hydrate, gives rate coefficients which quantify the preference for α over β cyclisation when 6′-substituents are present. These are considered in terms of stereoelectronic factors which may be responsible for
分析用于生成3-羟基黄烷酮的2'-羟基查耳酮环氧化物单阴离子和大部分生成水合物的一些6'-烷氧基取代的类似物环化的pH速率分布,得出速率系数,量化了α对β的偏好存在6'-取代基时环化。这些是根据可能导致偏爱的立体电子因素来考虑的。还报道了其中形成金酮和香豆香酮的金酮水合物随后反应的速率系数。