Standard molar enthalpies of formation of the three isomers of chloroanisole

The standard (p∘ = 0.1 MPa) molar enthalpies of formation, in the liquid phase, of 2-, 3- and 4-chloroanisoles, at T = 298.15 K, were derived from their standard massic energies of combustion, in oxygen, to yield CO2(g) and HCl · 600H2O(l), measured by rotating bomb combustion calorimetry. The Calvet high-temperature microcalorimetry technique was used to measure the standard molar enthalpies of vaporization of these compounds.-ΔcUm∘(l)/(kJ·mol-1)-ΔfHm∘(l)/(kJ·mol-1)ΔlgHm∘/(kJ·mol-1)2-Chloroanisole3622.0 ± 1.6154.1 ± 1.855.0 ± 0.83-Chloroanisole3615.9 ± 1.6160.2 ± 1.853.6 ± 0.84-Chloroanisole3619.2 ± 1.5156.9 ± 1.854.8 ± 0.8Full-size tableTable optionsView in workspaceDownload as CSVFrom these two sets of experimental values, the standard molar enthalpies of formation in the gaseous phase, at T = 298.15 K, were derived, compared with the same parameters estimated by the Cox scheme and interpreted in terms of molecular structure.