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QUINONES

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Originally appearing in Volume V22, Page 760 of the 1911 Encyclopedia Britannica.
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QUINONES , in organic See also:

chemistry, a See also:group of compounds in which two See also:hydrogen atoms of a See also:benzene See also:nucleus are replaced by two See also:oxygen atoms. This replacement may take See also:place either in the ortho or See also:para positions, giving rise to orthoquinones or to paraquinones; metaquinones do not appear to have been isolated. The para or true quinones are obtained by the oxidation of See also:hydrocarbons with chromic See also:acid or of various para di-derivatives of benzene with chromic acid mixture, such, for example, as para-aminophenol, para-phenylene diamine, paraaminoazobenzene, &c. H. v. Pechmann (Ber., 1888, 21, p.

End of Article: QUINONES

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