Correlation Gas Chromatographic Study of the Vaporization Enthalpies and Vapor Pressures of the Major Sesquiterpene Hydrocarbons in Patchouli Oil

The vaporization enthalpies and vapor pressures from T = 298.15 K to the boiling temperature at p degrees = 101 325 Pa of a number of sesquiterpene hydrocarbons in patchouli oil, beta-patchoulene, cycloseychellene, alpha-guaiene, seychellene, alpha-patchoulene, and alpha-bulnesene are reported using a series of different hydrocarbon standards. beta-Elemene and E beta-caryophyllene, two compounds studied previously and also present in patchouli oil as minor components, were used as both standards and targets. Their use as targets was to evaluate the reproducibility of thermochemical properties evaluated in complex mixtures by correlation gas chromatography. The results are compared to available literature data, both estimated and experimental.