Journal
MOLECULES
Volume 28, Issue 18, Pages -Publisher
MDPI
DOI: 10.3390/molecules28186686
Keywords
fragrance compounds; energetic study; enthalpy of combustion; enthalpy of phase transition; enthalpy of formation; methyl substituent; contaminants
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The study determined the enthalpies of formation of methyl 3-methylanthranilate and methyl 5-methylanthranilate in the gaseous phase using experimental measurements and computational analysis. The effects of methyl substituents in different positions of the ring were evaluated and analyzed.
The enthalpies of formation in the gaseous phase of methyl 3-methylanthranilate and methyl 5-methylanthranilate were determined from experimental measurements of the corresponding standard energies of combustion, obtained from combustion calorimetry, and the standard enthalpies of vaporization and sublimation, obtained from Calvet microcalorimetry and Knudsen mass-loss effusion. A computational study, using the G3(MP2)//B3LYP composite method, has also been performed for the calculation of the gas-phase standard enthalpies of formation of those two molecules at T = 298.15 K, as well as for the remaining isomers, methyl 4-methylanthranilate and methyl 6-methylanthranilate. The results have been used to evaluate and analyze the energetic effect of the methyl substituent in different positions of the ring.
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