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Variable-temperature 1H NMR spectra of 3 in DMF-d7. As temperature is elevated above 50 °C, the distinct resonances for the exo and endo conformers coalesce. For full peak assignment of 3 at 20 °C, see Figure S12 in the Supporting Information. VT-NMR spectra for 1 and 2 are provided in the Supporting Information, Figures S4 and S5. The singlet at 8 ppm marked by an asterisk is from the solvent.
