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(organic chemistry)
CO(CHCH)2CO Yellow crystalline compound with irritating aroma; melts at 116°C; soluble in alcohol, alkalies, and ether; used to make dyes and hydroquinone. Also known as benzoquinone; chinone.



any one of a class of cyclic diketones in which both carbonyl (C=O) groups are in a system of conjugated double bonds. Quinones are obtained in the form of colored crystals, which have a sharp odor. For example, para-benzoquinone (I), with a melting point of 116°C, and 1,4-naphthoquinone (II), with a melting point of 128.5°C, are yellow, while ortho-benzoquinone (III), with a melting point of 70°–80°C (with decomposition), and anthraquinone are red (seeANTHRAQUINONE).

Various pigments in nature are derivatives of quinones; for example, muscapharin, the dye substance of the fly agaric, is a derivative of para-benzoquinone. Quinones are readily reduced to yield diatomic phenols [for example, in industry, hydroquinone is obtained from (I) in this way]. They actively enter in diene synthesis,

as well as form molecular complexes with phenols. They are used in analytical chemistry.

Quinones are obtained by several methods, including the oxidation of the aromatic hydrocarbons or of their hydroxy or amino derivatives; for example, (I) is obtained by the oxidation of aniline, while (II) and anthraquinone are obtained by the oxidation of naphthalene and anthracene, respectively. Quinones and their derivatives are intermediate products in the production of dyes (seeANTHRAQUINONE DYES). They are also used as fungicides, insecticides, and tanning agents. 2-Methyl-1,4-naphthoquinone is a vitamin of the vitamin K group.

References in periodicals archive ?
Exposure to diverse backgrounds also is important, Quinones said, pointing to her own experience and the inspiration her parents provided.
As Filipinos, we're hoping that there would be additional gas, it will be for the benefit of the country if there would be additional gas," Quinones stressed.
After identifying quinones as potential energy storage molecules, the Harvard researchers used high-throughput screening techniques to sort through 10,000 variants, searching for ones that had all the right properties for a battery--the right voltage levels, the ability to withstand charging and discharging, and the ability to be dissolved in water so they could be stored in liquid tanks.
The researchers introduced quinones to the samples.
Thus the kinetics of hydrogen bond formation and the number of hydrogen bonds formed in quinone anion radicals / dianion offers attractive area of study.
The winner will be announced in September and have her story converted into an original song written and performed by Quinones during Fiestas Patrias in Los Angeles on Sept.
Also on the agenda were panel discussions, moderated by Quinones, that informed subsequent small group discussions among participants.
Hogar de los Quinones, estudio de rockeros y cineastas --las insolitas imagenes de Aurora y Alfonso Cuaron--, taller de pintores y objetualistas --Ruben Ortiz, Monica Castillo, Diego Toledo, entre otros--, punto de reunion de promotores y curadores --Ruben Bautista, Guillermo Santamarina-- y galeria alternativa para artistas de diferentes generaciones --Helen Escobedo, Aceves Navarro, Gabriel Orozco--, La Quinonera fue un referente que antecedio la institucionalizacion y cooptacion mercantil tanto de la joven pintura de esos anos, como de las practicas vinculadas con esteticas postconceptuales.
This is my country," said Quinones, 20, an incoming Kansas University transfer from Kansas City, Mo.
Quinones learned the value of hard work early, working at the age of 5 at his father's small gas station outside the border town of Mexicali.
Agon means struggle, contest, playing to win a game, and Quinones declaims, as his jacket declares, "Dualism is a motif that runs through literature of all genres and historical contexts, inspiring argumentation at the highest level and showing the formation of ideas in association as a creative exchange.
El hampa envio un mensaje de crueldad y reto al Ejercito mexicano mediante el martirio al general Mauro Enrique Tello Quinones, a quien e rompieron los huesos de brazos y piernas con algun objeto contundente, ademas de ser golpeado en la cabeza y el torax, y recibir 11 proyectiles de alto calibre.