Figure 8

Partial ¹H NMR spectra. (i) 2; (ii) 2 and 0.25 equivalent of OAc⁻; (iii) 2 and 0.5 equivalent of OAc⁻; (iv) 2 and 1 equivalent of OAc⁻; (v) 2 and 1.5 equivalent of OAc⁻; (vi) 2 and 2 equivalent of OAc⁻.