The oxidation of ascorbic acid (H₂A) by [Ru^VI(N)(L)(MeOH)]⁺ in aqueous acidic solutions has the following stoichiometry: 2[Ru^VI(N)] + 3H₂A → 2[Ru^III(NH₂–HA)]⁺ + A. Mechanisms involving HAT/N-rebound at low pH (≤2) and nucleophilic attack at the nitride at high pH (≥5) are proposed.