Dipole moments of methyl- and trifluoromethyl-substituted methyl benzoates

Abstract

Apparent dipole moments in benzene of 1,3-bistrifluoromethylbenzene and of the methyl esters of 2,4-dimethyl-,2,5-dimethyl-, 3,5-dimethyl-, 2,4-bistrifluoromethyl-, 2,5-bistrifluoromethyl-, 3,5-bistrifluoromethyl-, and 3-trifluoromethyl- benzoic acid have been determined. The values obtained can be explained either by rotation of the ester group out of the plane of the ring or, in the case of the 3-, and 2,4-substituted esters, by the existence of cis- and trans-isomers.