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Triketones
In organic chemistry, a triketone or trione is an organic compound containing three ketone () groups. The simplest triketones, such as cyclopropanetrione and 2,3,4-pentanetrione, are only of occasional theoretical interest. More pertinent are triacetylmethane and 2,4,6-heptanetrione. Both species exist predominantly in the enol () forms. Image:Croconic_acid.svg, Croconic acid Image:Ac3CH.svg, Triacetylmethane Image:2,4,6-heptanetrione.svg, 2,4,6-Heptanetrione Occurrence and significance Tri- and polyketones are of practical importance as intermediates in the biosynthesis of polyketides. These natural products are a major source of antibiotics. See also * Diketone In organic chemistry, a dicarbonyl is a molecule containing two carbonyl () groups. Although this term could refer to any organic compound containing two carbonyl groups, it is used more specifically to describe molecules in which both carbonyls ... References External links *{{Commonscatinline, Trik ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyclopropanetrione
Cyclopropanetrione or trioxocyclopropane is a little-known oxide of carbon with formula C3O3. It consists of a ring of three carbon atoms each attached to an oxygen atom with a double bond. Alternately, it can be thought as a trimer of carbon monoxide. This compound is thermodynamically unstable and has not been produced in bulk. However, it has been detected using mass spectrometry. It is the neutral equivalent of the deltate anion C3O32−, known since 1975. An equivalent hydrate hexahydroxycyclopropane or cyclopropane-1,1,2,2,3,3-hexol, (-C(OH)2-)3 also exists. This contains geminal In chemistry, the descriptor geminal () refers to the relationship between two atoms or functional groups that are attached to the same atom. A geminal diol, for example, is a diol (a molecule that has two alcohol functional groups) attached t ... hydroxy groups. References {{Oxides of carbon Oxocarbons Cyclopropanes Triketones Cyclic ketones Conjugated ketones ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triacetylmethane
Triacetylmethane is the organic compound with the formula . It is a colorless liquid that is soluble in organic solvents and in alkaline water. It readily forms an enolate. The enolate forms a variety of metal complex A coordination complex consists of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of bound molecules or ions, that are in turn known as ''ligands'' or complexing agents. Many ...es related to the metal acetylacetonates.{{cite journal , doi=10.1016/j.ica.2008.11.017, title=Coordinating Properties of the Anionic Ligand (MeCO)2C(−)C(X)Me (X=O or NH) Toward Transition Metal(II) Centers , year=2009 , last1=Basato , first1=Marino , last2=Caneva , first2=Elisabetta , last3=Tubaro , first3=Cristina , last4=Veronese , first4=Augusto Cesare , journal=Inorganica Chimica Acta , volume=362 , issue=8 , pages=2551–2555 References Triketones Chelating agents Tridentate ligands 3-Hydroxypropenals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Croconic Acid
Croconic acid or 4,5-dihydroxycyclopentenetrione is a chemical compound with formula or . It has a cyclopentene backbone with two hydroxyl groups adjacent to the double bond and three ketone groups on the remaining carbon atoms. It is sensitive to light, soluble in water and ethanol and forms yellow crystals that decompose at 212 °C. The compound is acidic and loses the protons from the hydroxyl groups (p''K''a1 = and p''K''a2 = at 25 °C). The resulting anions, hydrogencroconate and croconate are also quite stable. The croconate ion, in particular, is aromatic and symmetric, as the double bond and the negative charges become delocalized over the five CO units (with two electrons, Hückel's rule means this is an aromatic configuration). The lithium, sodium and potassium croconates crystallize from water as dihydrates but the orange potassium salt can be dehydrated to form a monohydrate. The croconates of ammonium, rubidium and caesium crystallize ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
