Fig. 3. X-band first derivative EPR spectra of (a) B₂pin₂/MeOK/2/18-C-6 reaction solution in THF; (b) the borylation reaction of 4-MeOPhBr employing B₂pin₂·MeOK/2 in DMSO; (c) the solution of complex 9 with 18-C-6 in THF; (d) the THF solution of complex 10 prepared by the reaction between 4-phenylpyridine radical anion and MeOBpin (all acquired at room temperature). (e) Is the simulated EPR spectrum with parameters listed in Table 1.