作者:E. Beška、P. Rapoš、P. Winternitz
DOI:10.1039/j39690000728
日期:——
Methyl esters derived from both the cyclic (hydroxy-lactone) and the open tautomeric structure of the respective acids have been prepared by esterification of αβ-dihalogeno-β-formylacrylic acids. The structure of the esters has been determined with the aid of u.v., i.r., and n.m.r. spectroscopy and by chemical methods. The normal esters are thermolabile and rearrange to the respective pseudo-esters
通过αβ-二卤代-β-甲酰基丙烯酸的酯化反应制备了衍生自相应酸的环状(羟基-内酯)和开放互变异构结构的甲酯。借助于紫外,红外和核磁共振光谱法和化学方法已经确定了酯的结构。普通酯是热不稳定的,并且可以重新排列成各自的假酯。建议一种重新排列的机制。