title: Benzenesulfonyl chloride
text: # Benzenesulfonyl chloride
  
  Benzenesulfonyl chloride is an organosulfur compound with the formula $C_6H_5SO_2Cl.$ It is a colourless viscous oil that dissolves in organic solvents, but reacts with compounds containing reactive N-H and O-H bonds. It is mainly used to prepare sulfonamides and sulfonate esters by reactions with amines and alcohols, respectively. The closely related compound toluenesulfonyl chloride is often preferred analogue because it is a solid at room temperature and easier to handle.
  
  The compound is prepared by the chlorination of benzenesulfonic acid or its salts with phosphorus oxychloride or, less commonly, by a reaction between benzene and chlorosulfuric acid.
  
  The Hinsberg test for amines involves their reaction with benzenesulfonyl chloride.
  
  