Abstract

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. - Δ c H m ∘ ( l ) / ( kJ · mol - 1 ) Δ l g H m ∘ / ( kJ · mol - 1 ) 1-Ethylpiperidine 4776.8 ± 1.6 39.44 ± 0.65 2-Ethylpiperidine 4740.3 ± 1.5 48.22 ± 0.89 In parallel, theoretical calculations have been carried out for all the ethylpiperidine isomers, enabling the estimation of gas-phase enthalpies of formation for these compounds. The comparison with the present experimental data is very good and, thus, supports the quality of the results calculated for the 3-ethyl and 4-ethylpiperidines.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.