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In the 1HNMR spectrum (270 MHz in CDCl2CDCl 2) the coalescence temperature of the signals corresponding to the methyl group at C2 of l,2-bis(2-methyl-3-benzothienyl)hexafluorocyclopentene (8; site exchange of antiparallel and parallel conformations) was 85 °C Coalescence of signals corresponding to any proton in 3 was not observed at temperatures lower than 125 °C (270MHz in CDC12CDC12 2, Therefore the conformational change to establish the Boltzmann equilibrium at low temperature (such as -70 °C) is not possible within a short time even for 8, and is naturally not possible for more crowded 3
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2). Therefore the conformational change to establish the Boltzmann equilibrium at low temperature (such as -70 °C) is not possible within a short time even for 8, and is naturally not possible for more crowded 3.
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