Abstract
| - Thermal equilibrations among the three possible monodeuterium-labeled 1,3-cyclohexadienes have been followed in thegas phase at temperatures from 254 to 284 °C. The temperature-dependent rate constants for the 1,5-shift of a singlehydrogen lead to the activation parameters Ea = (40.1 ± 0.8)kcal/mol, log A = (12.1 ± 0.3), and ΔS⧧ = −(6.3 ± 1.3) e.u.These activation parameters are reconciled with experimental values reported earlier for reactions starting with 1,4-d2-cyclohexadiene.
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