Preparation and separation of all possible rotamers of a stereochemical analog of meso -tartaric acid: optically inactive and optically active isomers of ( R , S )-2,2′-bis(methoxycarbonyl)-6,6′-dimethyl-9,9′-bitriptycyl
作者:Shinji Toyota、Takashi Nakagawa、Masashi Kotani、Michinori Ōki、Hidehiro Uekusa、Yuji Ohashi
DOI:10.1016/s0040-4020(02)01408-4
日期:2002.12
was optically inactive Ci conformation. The other optical active forms were resolved to give a pair of enantiomers, which were characterized by optical rotation and CD spectra. Thus the optical inactivity of a compound such as meso-tartaric acid that can take Ci conformation in solution, is now ascribed to that the molecule has an optically inactive Ci conformer and equal amounts of optically active
通过色谱法分离标题化合物的所有三种可能的旋转异构体,并通过NMR和X射线分析明确鉴定。异构体之一是光学惰性的C i构象。解析其他光学活性形式,得到一对对映异构体,其通过旋光度和CD光谱表征。因此,一个化合物的光学不活动如内消旋-酒石酸,可以采取Ç我构象在溶液中,现在归因于该分子具有一个不旋光Ç我构象异构体和等量的光学活性构象异构体,这是对映体的,在溶液中。