diketone


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diketone

[dī′kē‚tōn]
(organic chemistry)
A molecule containing two ketone carbonyl groups.
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(63) Similar to diacetyl, 2,3-penanedione is a diketone used for, among other things, synthetic flavoring to impart a buttery or cheesy note.
Typical oxidation of polyphenols is best depicted by the oxidation of a diphenolic compound (catechol) into the corresponding quinone (Equation (10)) and of enediol (ascorbic acid) into vicinal diketone (Equation (11)):
As pH increases, this form transforms to anion ([DC.sup.-] and [DC.sup.2-], respectively, above pH 7.7 and 9.5), owing to the deprotonation of phenolic diketone moiety and tricarbonyl system.
The TC molecule has three multiple ionisable functional groups: a tricarbonylamide group (C-1-C-3), a dimethylammonium group (C-4) and a phenolic diketone group (C-10-C-12) and is amphoteric (Fig.
A diketone isolated from the stem bark extract of Maytenus elaeodendroides showed feeding deterrent activity on Sitophylus oryzae (L.) (Coleoptera: Curculionidae), a plague that causes significant damage to rice growing (Nogueiras et al.
Eom et al., "Sensitized near-IR luminescence of lanthanide complexes based on push-pull diketone derivatives," Dalton Transactions, vol.
Many previous studies proved that CUR has been widely investigated and was shown to have an important role in pharmacological activities because of its low toxicity, low adverse reactions, and special structure (hydroxyl groups of the benzene rings, the double bonds in the alkene part, and the diketone moiety) [6], such as anti-inflammatory, anticancer, antioxidant, anticoagulation, antiatherosclerotic, antimutagenic, antibiotic, antiviral, antifungal, and antiamyloid activities [6-8].
Rick Westrom, SVP of strategic sourcing and R&D director for INX International Ink Co., reported that TiO, prices are increasing, as is diketone, a key intermediate material.
This very aromatic diketone (sensory threshold: 16 ng/L) is reminiscent of the odor of prune.
The resulting dialdehyde (1) and diketone (2), both new compounds, were then subjected to Claisen-Schmidt reaction under high dilution condition when the macrocyclic bischalcone 3 was obtained in moderate yield (Scheme 1).
Morgan's findings provide strong evidence that inhaled diketone vapors can produce airway fibrotic disease and support a causal relationship between workplace exposure to high concentrations of diketones and the development of bronchiolitis obliterans, according to John Morris, a professor of pharmacology and toxicology at the University of Connecticut, Storrs.