Trichloromethyl

Trichloromethyl is a functional group that has the formula –CCl3. The naming of is group is derived from the methyl group (which has the formula –CH3), by replacing each hydrogen atom by a chlorine atom. Compounds with this group are a subclass of the organochlorines. Some notable examples of compounds with this group are trichloromethane H–CCl3, 1,1,1-trichloroethane H3C–CCl3, and chloral HOC–CCl3. The trichloromethyl group has a significant electronegativity.[citation needed] For this reason, trichloromethyl-substituted acids are often stronger than the original. For example, the acidity constant (pKa) of trichloroacetic acid HOOC–CCl3 is 0.77, whereas that of acetic acid is 4.76.[1][2]

By the same principle, the trichloromethyl group generally lowers the basicity of organic compounds.

## See also

* Trifluoromethyl
* Trichloromethoxy

## References

1. ↑ "Trichloromethyl | CCl3 | ChemSpider". http://www.chemspider.com/Chemical-Structure.109615.html.
2. ↑ "Trichloromethyl radical" (in en). https://webbook.nist.gov/cgi/cbook.cgi?ID=C3170807&Mask=800.

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