We report the synthesis of a single enantiomer of an α-methyl-trans-cyclopropane unit present in a number of mycolic acids and its incorporation into a reported 1, 2- dialkylcyclopropane meromycolate that contains one cis-1, 2-dialkylcyclopropane and one α- methyl-trans-1, 2-dialkylcyclopropane.