# Ketone prefix organic chemistry nomenclature

Is there a difference between the prefixes keto- and oxo-?

• keto- $\subset$ oxo-. – andselisk Dec 29 '18 at 5:03
• oxo- is more used to just describe a c=o while keto- is used when is is specifically part of a ketone – H.Linkhorn Dec 29 '18 at 9:47

The prefix ‘keto’ doesn’t exist in the current version of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book). Already in the 1979 Recommendations, the prefix ‘oxo’ is used to indicate $$\ce{=O}$$ when the group cannot be cited as suffix.
To indicate a double-bonded oxygen that is part of a ketonic structure, the term keto is sometimes used as a prefix, but such use has been abandoned by IUPAC for naming specific compounds. A traditional use of keto is for indicating oxidation of $$\ce{CHOH}$$ to $$\ce{C=O}$$ in a parent compound that contains $$\ce{OH}$$ groups, such as carbohydrates. E.g. 3-ketoglucose.