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Abstract
Abstract Dynamic stereochemistry of di(3-methyl-1-azulenyl)phenylmethyl hexafluorophosphate (5) was studied by temperature dependent 1H NMR spectra. The low temperature NMR indicated that the compound (5) exists in three propeller conformations (C1 and two C2 symmetry), and at higher temperature the spectra reflect rapid isomerization, which were interpreted by the flip mechanism of one azulene ring. The processes have activation energies of 53.8 and 45.2 kJ mol−1.
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