Thermochemical studies of 3-methylpyrazole and 1,3,5-Trimethylpyrazole (cas 1072-91-9)

Add time:07/25/2019    Source:sciencedirect.com

The standard (p∘=0.1MPa) molar enthalpies of formation, at T=298.15K, in the condensed phases of two alkylpyrazoles, viz. 3-methylpyrazole and 1,3,5-trimethylpyrazole, were determined by static bomb calorimetry. Calvet microcalorimetry was used to measure the standard molar enthalpy of vaporisation of 1-methylpyrazole and the standard molar enthalpy of sublimation of 1,3,5-trimethylpyrazole. From these two sets of results, the standard molar enthalpies of formation of both alkylpyrazoles in gaseous phase, at T=298.15K, were derived. -ΔcUm∘(cr or l)kJ·mol-1Δcr, or lgHm∘kJ·mol-1ΔfHm∘(g)kJ·mol-13-Methylpyrazole2504.5 ± 1.665.9 ± 2.0140.1 ± 2.61,3,5-Trimethylpyrazole3806.4 ± 1.861.7 ± 1.681.6 ± 2.6

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