Room temperature ionic liquids, such as N,N,N-trimethyl-N-(2-hydroxyethyl)ammonium bis(trifluoromethylsulfonyl)imide, [N-1112(OH)][NTf2] and 1-ethyl-3-methylimidazolium ethylsulfate, [C(2)mim][C2SO4], have been used for the electroreductive intramolecular cyclization of unsaturated bromo derivatives 1 in Ni(II)-catalyzed reactions. Controlled-potential electrolyses led to five-membered-ring compounds in moderate to good yields. Cyclic voltammetry in these ionic liquid systems was also investigated. (C) 2015 The Electrochemical Society. All rights reserved.