The 2-hydroxycyclopentanecarboxylic acids, reported previously as liquids, have been isolated in solid form. Derivatives have been prepared. A study of some of their physical constants led to the assignment of cis-configuration to the acid melting at 52-53.4"(cor.), and of trans to the acid melting at 68.3-69.0"(cor.).
![trans-2-[3,5-Dinitro-benzoyloxy]-cyclopentan-carbonsaeure-(1)-aethylester Structure](https://image.chemsrc.com/caspic/448/63578-04-1.png)