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- Q746380 subject Q6465732.
- Q746380 abstract "Croconic acid or 4,5-dihydroxycyclopentenetrione is a chemical compound with formula C5H2O5 or (C=O)3(COH)2. 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 hydrogen cations H+ from the hydroxyls (pK1 = 0.80 ± 0.08 and pK2 = 2.24 ± 0.01 at 25 °C). The resulting anions, hydrogencroconate C5HO5− and croconate C5O52− 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. 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 in the anhydrous form. Salts of barium, lead, silver, etc. are also known.Croconic acid also forms ethers such as dimethyl croconate where the hydrogen atom of the hydroxyl group is substituted with an alkyl group.".
- Q746380 thumbnail Croconic_acid.svg?width=300.
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- Q746380 name "Croconic acid".
- Q746380 type ChemicalCompound.
- Q746380 type ChemicalSubstance.
- Q746380 type ChemicalObject.
- Q746380 type Thing.
- Q746380 type Q11173.
- Q746380 comment "Croconic acid or 4,5-dihydroxycyclopentenetrione is a chemical compound with formula C5H2O5 or (C=O)3(COH)2. 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 hydrogen cations H+ from the hydroxyls (pK1 = 0.80 ± 0.08 and pK2 = 2.24 ± 0.01 at 25 °C).".
- Q746380 label "Croconic acid".
- Q746380 depiction Croconic_acid.svg.
- Q746380 name "Croconic acid".