Abstract
The reduction of the 2-cyclohexen-1-one, mediated by some transition metal ions (Zn 2+, Cu 2+, Ni 2+, Co 2+ and Fe 2+) and complexes ([Ni II(bipy)]Br 2 and [Fe II(bipy)]Br 2, where bipy = 2,2′-bipyridine), was carried out by using a homogeneous electromediated system: sacrificial anode, nickel cathode, (0.2 M) NaI as supporting electrolyte and undivided cell. A constant current of <100 mA was applied with a maximum cell potential of 2.0 V. Cyclohexanone was the principal product in major cases yielding 98%. Cyclohexanol was also detected in some cases. The selectivity of the process can be controlled by choosing Ni as mediator and Zn or Ni as sacrificial anode. A more reactive system can be reached when Fe sacrificial anode is used, giving cyclohexanol as major product (87%).
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