Enthalpies of combustion of methyl benzoate (I), methyl
o-toluate (II), methyl m-toluate (III),
methyl
p-toluate (IV), monomethyl terephthalate (V), dimethyl
phthalate (VI), and trimethyl 1,2,4-benzenetricarboxylate (VII) have been determined using bomb calorimetry.
Enthalpies of evaporation of these
substances (I−VII), and also of dimethyl terephthalate (VIII) and
dimethyl isophthalate (IX), have been
measured calorimetrically. Standard molar enthalpies of formation
in the gas phase have been calculated
(in kJ·mol-1): (I) (−277.7 ±
1.3), (II) (−301.5 ± 1.9), (III) (−309.6 ± 1.6), (IV) (−308.7
± 1.6), (V) (−648.7
± 2.3), (VI) (−606.2 ± 2.6), (VII) (−963.3 ± 2.9), (VIII)
(−627.4 ± 1.1), and (IX) (−627.1 ± 1.1).
Values
of additive constants have been obtained to calculate enthalpies of
formation of methyl esters of benzene
carboxylic acids in the crystal and gas states.
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