It is clear from the data of Table that aluminum acts as a promoter of this scavenging reaction, passing from an endergonic process in the absence of aluminum (+0.16/+0.08 eV for exp/theo values) to an exergonic spontaneous reaction when aluminum is present,-0.15/-0.05 eV. The methylation of hydroquinones also promotes the scavenging reaction. We observe synergy between methylation and the presence of aluminum, obtaining the highest exergonicity with a value of -0.42/-0.28 eV for the reaction with methylated hydroquinone in the presence of aluminum. In summary, aluminum, albeit a non-redox metal, can enhance the electron transfer process, and it does so by strongly stabilizing the reduced form of DPPH•.