Compounds containing an oxygen atom,
=O, doubly bonded to carbon or
another element. The term thus embraces
aldehydes,
carboxylic acids,
ketones,
sulfonic acids,
amides and
esters. Oxo used as an adjective (and
thus separated by a space) modifying another class of compound, as in
oxo carboxylic acids,
indicates the presence of an oxo substituent at any position. 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
CHOH
to
C=O
in a parent
compound that contains
OH
groups, such as
carbohydrates,
e.g. 3-ketoglucose.
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on
structure (IUPAC Recommendations 1995))
on page 1355
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
