The assignment of the configuration of racemic trans-trans and cis-cis-2,3-dicarboxycyclopentylacetic acid previously proposed has been confirmed by the syntheses of these compounds through other unambiguous reaction sequences. The trans-cis-isomer has been prepared by the epimerization of the 3-carboxyl group of the cis-cis-isomer, but the attempt to synthesize the fourth isomer (cis-trans) has been
先前提出的外消旋反式和顺式-顺式-2,3-二羧基
环戊基乙酸的构型的分配已通过这些化合物的合成通过其他明确的反应序列得到证实。反式-顺-异构体已经通过顺-顺-异构体的3-羧基差向异构化制备,但合成第四个异构体(顺-反)的尝试没有成功。