Abstract Chlorination of oleyl alcohol gives mainly 9,10‐dichlorostearyl alcohol but a variety of other products are also formed. By‐products include 9(10)‐(9,10‐dichlorostearoxy)‐10(9)‐chlorostearyl alcohol (14%) and 9,10‐dichlorostearyl 9,10‐dichlorostearate (3–4%) in addition to three or four less clearly defined products (12%). One group of products is apparently derived from participation of the hydroxyl group in the chlorine addition step while the other products formed by the reaction of the hydroxyl group with chlorine or chlorine and hydrogen chloride.