The fluorine n.m.r. spectrum of fluorocyclootatetraene has been shown to be temperature dependent between 30 and 65º. This is attributed to changes in the rate of an inversion-bond-shift process which is slow on the n.m.r. time scale at low temperatures. The free energy of activation for inversion is approximately 12 kcal/mole at -33º.
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Gwynn et al. (1965) studied this question.
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