Room Temperature EPR Analysis of Radicals by Spin Trapping with BMPO. Reaction Conditions: Co(acac)2 (1.0 equiv., 0.10 mmol), 2 (3.0 equiv., 0.30 mmol) in 0.80 mL DCB, 90 °C, for 15 min under an Ar atmosphere, followed by the gas exchange of Ar for O2, heated at 90 °C for 15 min, followed by quenching with a solution of BMPO.