Isomeric esters of αβ-dihalogeno-β-formylacrylic acids
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-formylacrylicacids. 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