Epi-isomerism - epiisomerism

Japanese: エピ異性 - エピいせい
Epi-isomerism - epiisomerism
A type of stereoisomerism. In compounds with two or more asymmetric carbon atoms, isomers that differ only in the configuration of one asymmetric carbon atom are called epimers. For example, D(+)-glucose and D(+)-galactose are epimers that differ only in the configuration of C4 (Figure 1). Epiisomerism is a type of diastereoisomerism. It was discovered by E. Fischer in 1890 while studying the chemistry of sugars. The interconversion between epimers is called epimerization.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
立体異性の一種。不斉炭素原子を2個以上もつ化合物において,1個の不斉炭素原子の立体配置だけが異なる異性体をたがいにエピマーepimer(エピ異性体)であるという。たとえば,D(+)‐グルコースとD(+)‐ガラクトースはC4の立体配置のみが異なるエピマーである(図1)。エピ異性はジアステレオ異性の一種である。1890年E.フィッシャーが糖類の化学を研究中に発見した。エピマー間の相互変換をエピ化という。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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