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Conversion of 2 into 3 by reaction with O2 in the presence of BPh4− and H+ in CH3CN solution at 25 °C. Left: amount of 3 formed as a function of the amount of BPh4− added to a solution containing 1 equiv. of both 2 and HClO4. Right: amount of 3 formed as a function of HClO4 added to a solution containing 1 equiv. of both 2 and BPh4−.
