The effects of the electrode material on electroreduction of 2-cyclohexen-1-one were examined using various metal-solid polymer electrolyte electrodes, i.e., unmodified, Bi-modified and Zn-modified Pt- and Au-Nafion, Bi-Selemion and Zn-modified Au-Selemion electrodes. A mixture of monomeric products such as cyclohexanone 2 and 2-cyclohexen-1-ol 3, and/or dimeric products such as the diketone 4, the hydroxyketone 5 and the glycol 6 were produced, the main products being largely dependent on electrolytic conditions. For example, modification of Pt-Nafion electrode with bismuth or zinc gave 2 selectively at high current efficiency. Modification of Au-Nafion electrode with bismuth was effective in giving dimeric products, whereas with Bi,Pt-Nafion and Zn,Pt- and Zn,Au-Nafion electrodes, only monomeric products were obtained. The use of Bj-Selemion and Zn,Au-Selemion electrodes gave preferentially dimeric products. (C) 1998 Elsevier Science Ltd. All rights reserved.