title: Tetrachloro-m-xylene
text: # Tetrachloro-m-xylene
  
  Tetrachloro-m-xylene (tetrachlorometaxylene, or TCMX) is the organochlorine compound with the formula $C_6Cl_4(CH_3)_2.$ It is the chlorinated derivative of m-xylene in which the four aromatic hydrogen atoms are replaced by chlorine. It is prepared by ferric chloride-catalyzed reaction of the xylene with chlorine.
  
  TCMX is used as an internal standard in the analysis of organochlorides, particularly organochloride pesticides.
  
  