trans-1,2-dimethylcyclopropane

trans-1,2-dimethylcyclopropane is a stereoisomer, meaning it has the same molecular formula and constitution as other isomers but differs in the spatial arrangement of its atoms. Specifically, it is a cis-trans isomer, a type of diastereomer, where the two methyl groups are on opposite sides of the plane defined by the cyclopropane ring. This arrangement is distinct from its cis counterpart, where the methyl groups would be on the same side of the ring. Unlike conformational isomers, cis- and trans-1,2-dimethylcyclopropane cannot be interconverted by simple rotation around bonds and are considered distinct compounds with different properties. The trans isomer of 1,2-dimethylcyclopropane exists as a pair of enantiomers.123