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. Author manuscript; available in PMC: 2022 Dec 15.
Published in final edited form as: J Am Chem Soc. 2021 Dec 2;143(49):20849–20862. doi: 10.1021/jacs.1c09280

Figure 2.

Figure 2.

(A) 1H NMR spectrum at −35 °C in THF-d8 of the reaction of 4 with FcBF4. Only the aromatic region is shown for clarity. The full spectrum is shown in Figure S19. The resonances associated only with 3 are highlighted in blue and those associated only with 5 are in red. Overlapping resonances from 3 and 5 are in purple. Asterisks indicate toluene and benzene impurities in the THF-d8. (B) Crystal structure of 5 shown as a ball and stick model. All H–atoms and the counterion are omitted for clarity.