trans-Cycloheptane was prepared at –78 °C by a singlet-sensitized photoisomerization of the cis-isomer, and its lifetime was measured at temperatures between –7.0 and +1.0 °C to give thermodynamic parameters for the thermal trans–cis isomerization: Ea= 18.7 kcal mol–1, log A= 12.2
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Inoue et al. (1981) studied this question.