n-butenes with allylic halides such as cinnamyl chloride and crotylchloride. The highly active catalyst RhCl3·3H2O was investigated, resulting 70% yield of codimers with cinnamyl chloride and 1-butene. Furthermore, the reaction is dependent on the molar ratio of allylicchloride to RhCl3·3H2O ratio, where a ratio of 75:1 is optimal at a catalyst concentration of 2 mol%. Additionally allylic compounds such