title: Chloromethyl methyl sulfide
text: # Chloromethyl methyl sulfide
  
  Chloromethyl methyl sulfide is the organosulfur compound with the formula $ClCH_2SCH_3.$ In terms of functional groups, it is a thioether and an alkyl chloride. The compound is structurally related to sulfur mustards, i.e., it is a potentially hazardous alkylating agent. The compound finds some use in organic chemistry as a protecting group. In the presence of base, it converts carboxylic acids $(RCO_2H)$ to esters $RCO_2CH_2SCH_3.$ The compound is prepared by treatment of dimethylsulfide with sulfuryl chloride.
  
  