Experimental and computational study on the thermochemistry of ethylpiperidines

Add time:08/27/2019    Source:sciencedirect.com

The standard (p∘ = 0.1 MPa) massic energies of combustion in oxygen of 1-ethylpiperidine and 2-ethylpiperidine, both in the liquid phase, were measured at T = 298.15 K by static bomb calorimetry. These values were used to derive the standard molar enthalpies of combustion and the standard molar enthalpies of formation, in the condensed phase, for these compounds. Further, the standard molar enthalpies of vaporization, at T = 298.15 K, of these two ethylpiperidine isomers were determined by Calvet microcalorimetry. The combustion calorimetry results together with those from the Calvet microcalorimetry, were used to derive the standard molar enthalpies of formation, at T = 298.15 K, in the gaseous phase.-ΔcHm∘(l)/(kJ·mol-1)ΔlgHm∘/(kJ·mol-1)1-Ethylpiperidine4776.8 ± 1.639.44 ± 0.652-Ethylpiperidine4740.3 ± 1.548.22 ± 0.89

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