Time courses of the oxidative imidoylation reaction under O2 (blue dashed lines) and under air (red solid lines). Reaction conditions: [N-methoxy-4-fluorobenzamide] = 101 mM, [tBuNC] = 153 mM, [Pd] = 5.0 mM (2.5 mol% Pd2(dba)3 · CHCl3), air or O2 balloon, Vtotal = 8.0 mL, dioxane, 65 °C. The dashed gray line represents the concentration of starting material.