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(a) Aerobic oxidation of p-substituted benzyl alcohol X–C6H4CH2OH (X = OCH3, CH3, H, CF3) catalyzed by Au24:PVP. (b) Hammett plot for the aerobic oxidation of p-substituted benzyl alcohol catalyzed by Au24:PVP dispersed in H2O.53 (c) Arrhenius plot for the benzyl alcohol oxidation (X = H). Reaction conditions: substrate 80 μmol; Au24:PVP 5 atom %; K2CO3 300 mol %; H2O 20 mL; air; 303 K (unless specified).
