The transformations of isomeric 1,3-chloroalcohols 1–4, with cyclohexane skeleton, were studied in aqueous solution containing barium hydroxide. As regards the compounds with cis-configuration, 1 gives the oxetane 5 by intramolecular nucleophilic substitution, while 3 gives the unsaturated alcohols 7 and 8 by elimination. In the case of the trans-isomers 2 and 4, fragmentation reactions occur in competition