any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes
any of a class of aromatic compounds having two carbonyl functional groups in the same six-membered ring
a crystalline substance, C6H4O2 (called also benzoketone), first obtained by the oxidation of quinic acid and regarded as a double ketone; also, by extension, any one of the series of which quinone proper is the type
Origin: [Quinine + ketone.]
A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure." The class includes some heterocyclic compounds. The prototypical member of the class are 1,4-benzoquinone or cyclohexadienedione, often called simply quinone. Other important examples are 1,2-benzoquinone, 1,4-naphthoquinone and 9,10-anthraquinone. Quinones are oxidized derivatives of aromatic compounds and are often readily made from reactive aromatic compounds with electron-donating substituents such as phenols and catechols, which increase the nucleophilicity of the ring and contributes to the large redox potential needed to break aromaticity.. Quinones are electrophilic Michael acceptors stabilised by conjugation. Depending on the quinone and the site of reduction, reduction can either rearomatise the compound or break the conjugation. Conjugate addition nearly always breaks the conjugation.
Chambers 20th Century Dictionary
kwin′ōn, n. or Benzoquinone, a golden-yellow crystalline compound usually prepared by oxidising aniline with potassium bichromate and sulphuric acid: a general name applied to all benzene derivatives in which two oxygen atoms replace two hydrogen atoms.—Also Kinone (kē′nōn), as Kinic—Quinic.
The numerical value of quinone in Chaldean Numerology is: 3
The numerical value of quinone in Pythagorean Numerology is: 5
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