STUDIES IN THE CYCLOPENTANE SERIES. PART I. SYNTHESIS OF 1-METHYLCYCLOPENTANE-1 : 2-DICARBOXYIC ACID IN CIS- AND TRANSFORMS.

A new method has been developed for the synthesis of substituted cyclopentane rings and by this method 1-methyl-cyclopentane-1 : 2-dicarboxylic add has been syn­thesised in cis- and trans-forms. Their stereochemical properties have been studied in detail and their analogy with the two forms of cyclopentanie-1 : 2-dicarboxylic acids have been established.