Abstract
The standard (p o = 0.1 MPa) molar enthalpies of formation \( {{\Updelta}}_{\text{f}} H_{\text{m}}^{\text{o}} ( {\text{l),}} \) of the liquid 2-methylfuran, 5-methyl-2-acetylfuran and 5-methyl-2-furaldehyde were derived from the standard molar energies of combustion, in oxygen, at T = 298.15 K, measured by static bomb combustion calorimetry. The Calvet high temperature vacuum sublimation technique was used to measure the enthalpies of vaporization of the three compounds. The standard (p o = 0.1 MPa) molar enthalpies of formation of the compounds, 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. The results obtained were −(76.4 ± 1.2), −(253.9 ± 1.9), and −(196.8 ± 1.8) kJ mol−1, for 2-methylfuran, 5-methyl-2-acetylfuran, and 5-methyl-2-furaldehyde, respectively.
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Acknowledgements
Thanks are due to Fundação para a Ciência e a Tecnologia, F.C.T., Lisbon, Portugal, and to FEDER for financial support to Centro de Investigação em Química da Universidade do Porto (CIQ-U.P.). L.M.P.F.A. thanks F.C.T. and the European Social Fund (ESF) under the Community Support Framework (CSF) for the award of a post-doctoral fellowship (SFRH/BPD/25490/2005).
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Ribeiro da Silva, M.A.V., Amaral, L.M.P.F. Standard molar enthalpies of formation of some methylfuran derivatives. J Therm Anal Calorim 100, 375–380 (2010). https://doi.org/10.1007/s10973-009-0636-9
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DOI: https://doi.org/10.1007/s10973-009-0636-9