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Partial 1H NMR spectra of 1 at different temperatures (500 MHz, CD3CN). One of the minor species shows two sets of signals, here highlighted for the methyl group and H2, a proton on the biphenyl backbone. As the room temperature spectrum after the temperature decrease (top spectrum) is equal to the initial room temperature spectrum before the VT NMR experiment (bottom spectrum), the observed processes are reversible.
