Take trichloromethane for example. Is its preferred IUPAC name:


or simply


And which is that rule in IUPAC that governs this naming? Thank you!


According to Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013,

P- The locant '1' is omitted in substituted mononuclear parent hydrides.

For the compound $\ce{CHCl3}$ (chloroform), the parent hydride is methane, which is mononuclear. Hence the locant '1' should be omitted in the preferred IUPAC name (PIN); it is simply trichloromethane.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.