Crossed molecular beam experiments were performed to elucidate the chemical dynamics of the para-tolyl (CHCH) radical reaction with molecular oxygen (O) at an average collision energy of 35.3 ± 1.4 kJ mol. Combined with theoretical calculations, the results show that para-tolyl is efficiently oxidized by molecular oxygen to para-toloxy (CHCHO) plus ground-state atomic oxygen via a complex forming, overall exoergic reaction (experimental, -33 ± 16 kJ mol; computational, -42 ± 8 kJ mol). The reaction dynamics are analogous to those observed for the phenyl (CH) plus molecular oxygen system which suggests the methyl group is a spectator during para-tolyl oxidation and that application of phenyl thermochemistry and reaction rates to para-substituted aryls is likely a suitable approximation.
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