Relative thermodynamic stabilities of ?-methylene-?-butyrolactone and a-angelicalactone

  title={Relative thermodynamic stabilities of ?-methylene-?-butyrolactone and a-angelicalactone},
  author={Esko Taskinen},
  • Esko Taskinen
  • Published 1994
  • Chemistry
  • 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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