-one

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The suffix -one is used in organic chemistry to form names of organic compounds containing the -C(=O)- group: see ketone.[1] Sometimes a number between hyphens is inserted before it to state which atom the =O atom is attached to. This suffix was extracted from the word acetone. The final "-e" disappears if it is followed by another suffix that starts with a vowel.

In IUPAC nomenclature for ketones, the suffix -one replaces the terminal "-e" of the corresponding alkane name and may be preceded by a locant number indicating the carbon position of the carbonyl group in the chain.[2] This system allows unambiguous identification of the compound’s structure, particularly in longer or branched carbon chains, where multiple carbonyl positions are possible.

References

  1. ^ International Union of Pure and Applied Chemistry, Commission on Nomenclature of Organic Chemistry (1993). Panico R; Powell WH; Richer JC (eds.). A guide to IUPAC nomenclature of organic compounds: recommendations 1993. Oxford: Blackwell Scientific Publications. ISBN 0-632-03702-4.
  2. ^ "Nomenclature of Aldehydes & Ketones". Chemistry LibreTexts. 2013-10-02. Retrieved 2026-01-06.


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