Tetrachloro-''m''-xylene (tetrachlorometaxylene, or TCMX) is the

organochlorine compound Organochlorine chemistry is concerned with the properties of organochlorine compounds, or organochlorides, organic compounds that contain one or more carbon–chlorine bonds. The chloroalkane class (alkanes with one or more hydrogens substituted ...

with the formula C₆Cl₄(CH₃)₂. It is the

chlorinated In chemistry, halogenation is a chemical reaction which introduces one or more halogens into a chemical compound. Halide-containing compounds are pervasive, making this type of transformation important, e.g. in the production of polymers, drugs. ...

derivative of ''m''-xylene in which the four aromatic hydrogen atoms are replaced by chlorine. It is prepared by

ferric chloride Iron(III) chloride describes the inorganic compounds with the formula (H2O)x. Also called ferric chloride, these compounds are some of the most important and commonplace compounds of iron. They are available both in anhydrous and in hydrated f ...

-catalyzed reaction of the xylene with chlorine. TCMX is used as an

internal standard In a chemical analysis, the internal standard method involves adding the same amount of a chemical substance to each sample and calibration solution. The internal standard responds proportionally to changes in the analyte and provides a similar, bu ...

in the analysis of

organochloride Organochlorine chemistry is concerned with the properties of organochlorine compounds, or organochlorides, organic compounds that contain one or more carbon–chlorine bonds. The chloroalkane class (alkanes with one or more hydrogens substituted ...

s, particularly organochloride pesticides.

References

Chlorobenzene derivatives {{organohalide-stub