The electrochemical method is represented in Scheme S4. It started with the activation of the nickel foam via acid treatment and ultrasounds, which removed the layer of nickel oxide (Scheme S6, flows 1-3). The activated nickel foam was placed in the H-cell as working electrode, followed by the rest of the components, reagents, and solvents (Scheme S6, flows 4-5) After a determined time, the electrodes were removed from the set up and nickel foam washed with ethanol (Scheme S6, flows 6-8). The mother liquor was purified by evaporation and distillation processes, leading to a fraction comprised by cyclohexanone as major component (Scheme S6, flows 9-13).