Also found in: Thesaurus, Medical, Encyclopedia.


1. Any of a class of organic compounds, such as acetone, characterized by having a carbonyl group in which the carbon atom is bonded to two other hydrocarbon groups and having the general formula R(CO)R′, where R may be the same as R′.

[German Keton, shortening and alteration of Aceton, acetone : Latin acētum, vinegar; see acetum + German -on, n. suff. (alteration of -en, from Greek -ēnē).]

ke·ton′ic (-tŏn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Mentioned in ?
References in periodicals archive ?
Lauoryl chloride used in the preparation of ketonic compounds, ester and high molecular weight alkyl radical etc..
GO can be regarded as a graphene sheet containing various oxygenated functional groups such as hydroxyl, ketonic, carboxyl, epoxide, peroxide, anhydride, and ether.
1b shows FT-IR spectrum of PABTBA with absorption peaks at 1170 cm-1, 1678 cm-1 and 1725 cm-1 correspondingly to C=S bonds and carbonyl functionalities for both ketonic and ester bonding.
Hydrocortisone has a broad O-H intermolecular hydrogen bonded peak at 3420 [cm.sup.-1], weak olefinic or aromatic H-C= stretch at 3015 [cm.sup.-1], merge C-H stretch at 2917 [cm.sup.-1], five-member ring ketonic stretch at 1720 [cm.sup.-1], six-member ring ketonic and enolic carbonyl stretch at 1665 [cm.sup.-1], C[H.sub.2] attached to ketonic of olefinic scissoring bend at 1433 [cm.sup.-1], C[H.sub.2]CO scissoring vibration at 1408 [cm.sup.-1] [31], and the fingerprint region which is distinct to every steroid.
The dominant features of the C k-edge spectra include: (1) quinone and diene C at 284.5 eV, (2) aryl and olefinic C at 285.2 eV, (3) unsaturated C at 286.1 eV, (4) phenolic (aromatic C connected to O group (COH) in phenols) and ketonic C (carbonyl substituted aromatic structures of quinones, phenols and ketones) at 286.7 eV, (5) aliphatic and carbonyl C (carbonyl functionalities from aromatic ketones) at 287.7 eV, (6) carboxylic C, carbonyl C in carboxylic acids, aromatic alcohols and polysaccharide structures at 288.4 eV, (7) O-alkyl C (e.g.
The ketonic extract was filtered using paperand with successive additions of acetone for complete removal of the pigments, being the volume filled to 25 mL with the same extractor.
These algae also contain some minor carotenoids among which canthaxanthin and astaxanthin, both with ketonic groups; stand out (Whittle and Casselton, 1975; Karlson et al., 1996).
The physicochemical changes which occur during photooxidative reactions are characterized by an increase in the concentration of the oxygen-containing groups such as peroxides, hydroperoxides, and ketonic carbonyl groups [6].
Meanwhile the essential oil from the same species growing in Jenin region had almost different components: the total essential oil represented 92.58% and the major represented class of phytoconstituents was ketonic products with 89.81% of total identified essential oil components.
Terpenoids (Ketonic): One milliliter of 2, 4-dinitrophenylhydrazine solutions (0.5 g dissolved in 100 ml of 2M HC1) was added to 2 ml aqueous solution of the extract.
(8) Other related factor is the development of metabolic acidosis caused by a high production of ketonic bodies resulting from protein and lipid metabolism.
Nalmefene has a methylene radical (C=CH2) substituted by a ketonic group (C=O) in position 6 with respect to naltrexone, and in comparison with naltrexone it has greater bioavailability (40-50%), a longer half life and greater affinity for delta and kappa opioid receptors.