Esters of 1-O-Demethylthiocolchicines: Formation of Isomers in Chloroform Solution
作者:Peter Kerekes、Arnold Brossi、Judith L. Flippen-Anderson、Colin F. Chignell
DOI:10.1002/hlca.19850680306
日期:1985.5.15
standing in CHCl3 solution significant changes in optical rotation, a duplication of 1H-NMR signals, and the formation of new isomers on TLC. Solid-state X-ray diffraction of O-acetylated colchinoids and thio analogs, showed out of planar arrangements of the aromatic substituents, but the analysis could not help to explain the structures of the newly formed isomers in CHCl3 solution.