Thermochemistry of some methoxypyridines
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Add time:07/31/2019 Source:sciencedirect.com
The standard (po = 0.1 MPa) molar enthalpies of formation, at T = 298.15 K, for the liquids 2-methoxypyridine, 4-methoxypyridine and 2,6-dimethoxypyridine were determined by static bomb combustion calorimetry. The standard molar enthalpies of vaporization, at T = 298.15 K, were measured by Calvet microcalorimetry. The standard (po = 0.1 MPa) molar enthalpies of formation of the three compounds studied, in the gaseous phase, at T = 298.15 K have been derived from the corresponding standard molar enthalpies of formation in the liquid phase and the standard molar enthalpies of vaporization, yielding ((−42.7 ± 1.9), (−18.2 ± 1.8) and (−233.5 ± 1.8)) kJ · mol−1, for 2-methoxypyridine, 4-methoxypyridine and 2,6-dimethoxypyridine, respectively.
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