Trapping of 1,3,5,7-Cyclooctatetraene Valence Tautomers. Thermodynamic Stability of Bicycloocta-2,4,7-triene

Article abstract of DOI:10.1021/jo00370a036

High-temperature equilibrium constants of trapped mixtures of 1,3,5,7-cyclooctatetraene and its valence tautomer bicyclo<4.2.0>octa-2,4,7-triene were obtained by using a high-temperature thermal trapping technique and gave values for the thermodynamic parameters ΔS⁰ and ΔH⁰ of -4.3 +/- 0.7 eu and 5.5 +/- 0.6 kcal/mol, respectively.