摘要：

Alkenes undergo a rapid reaction with trifluoroacetic acid containing 0.25 M trifluoroacetic anhydride in the presence of a strong acid catalyst. The enthalpies of trifluoroacetolysis of the five n-hexenes were determined and were corrected to the enthalpies corresponding to the formation of the equilibrium mixture of 2-hexyl trifluoroacetate and 3-hexyl trifluoroacetate. The enthalpy difference between the latter was determined by measuring the equilibrium constant as a function of temperature. The trifluoroacetolysis data may be combined with the measured enthalpies of formation of the alkenes to derive more precise values for the latter. The enthalpies of reaction of water, 2-hexanol, and 3-hexanol with the reaction solvent were determined, and when combined with the other data lead to enthalpies of hydration of the alkenes and the enthalpies of formation of the alcohols.

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