The enthalpies of combustion and formation of some alkyl cyclopropanes

Abstract

The enthalpies of combustion of six alkyl cyclopropanes were measured by oxygen-bomb combustion calorimetry. The following values are reported for the standard enthalpy of combustion Δ H ° c (298.15 K)/kcal mol −1 of these compounds in the liquid state: methylcyclopropane, −(649.87±0.14); ethycyclopropane, −(805.91±0.18); 1, cis -2-dimethylcyclopropane, −(805.55±0.14); 1, trans -2-dimethylcyclopropane, −(804.49±0.18); 1,1,2-trimethylcyclopropane, −(951.21±0.18); 1,1,2,2-tetramethylcyclopropane, −(1107.94± 0.20). Values of the enthalpy of formation of the liquids were derived.