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Encyclopedia Britannica - Main :: PYR-RAY |
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QUINONES , in organic chemistry , a group
hydrogen atoms of a benzene
nucleus are replaced by two oxygen atoms. This replacement may take place either in the ortho or 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 hydrocarbons
acid or of various para di-derivatives of benzene
acid mixture, such, for example, as para-aminophenol, para-phenylene diamine, paraaminoazobenzene, &c. H. v. Pechmann (Ber., 1888, 21, p. 1417) has shown that a-diketones
caustic
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