Abstract
The relative thermodynamic stabilities of the title compounds have been determined by chemical equilibration in cyclohexane and dipentyl ether solutions at several temperatures. In each solvent, α-angelicalactone is favored thermodynamically, the values of ΔH θ and ΔS θ being ca. −8.0 kJ mol −1 and 2 J K −1 mol −1, respectively, for the γ-methylene-γ-butyrolactone → α-angelicalactone isomerization.
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