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Evolution of 1H NMR signals (acetone-d6) of compounds 31f (left) and 31e (right) upon changing the temperature from −40 to +24 °C (the downfield region of spectra is presented; black lines, experimental; red lines, theoretical; k, rate constant for the degenerate rotation of aryl substituent around the exocyclic Ar–N bond; and A and B, different rotamers of compounds 31e and 31f, respectively).
