Fig. 4: The mechanisms of O2 regulation for generating the coupling intermediates.

a O2 proportion-dependent CH3CONH2 yield; DMPO-trapping (with D-labeling, images above) and TEMP-trapping (images below) in situ EPR experiments under the O2 proportion of 0% (b), 75% (c), and 100% (d) respectively. The error bars in (a) were drawn based on the calculated standard error of two parallel tests.