Sulfides are formed by the addition of thiols (RSH) to 10-undecenoic acid (equation 1). The reactions proceed moderately rapidly at temperatures below 100" under free-radical conditions, often with the assistance of ultraviolet light. The acids [RS (CHZ) IOCOZH] have a terminal substituent R, which is alkyl (propyl, butyl, hexyl, heptyl, octyl, undecyl or dodecyl), hydroxyethyl, carboxymethyl, acetyl, benzyl, phenyl or 2-naphthyl. Some of the sulfides ...