In organosulfur chemistry, a sulfenyl chloride is a functional group with the connectivity , where R is alkyl or aryl. Sulfenyl chlorides are reactive compounds that behave as sources of .  They are used in the formation of  and  bonds. According to IUPAC nomenclature they are named as alkyl thiohypochlorites, i.e. esters of thiohypochlorous acid.  
Typically, sulfenyl halides are stabilized by electronegative substituents.  This trend is illustrated by the stability of  obtained by chlorination of carbon disulfide.