File:Image from page 260 of "Practical methods of organic chemistry" (1901) (14585011888).jpg

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Identifier: practicalmethods00gatt Title: Practical methods of organic chemistry Year: 1901 (1900s) Authors: Gattemann, Ludwig. [from old catalog] Subjects: Publisher: [n.p.] Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress

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Text Appearing After Image: Pseudocumidine But if the para position is occupied by an amido-, oxy-, or sulphonicacid-group, this is eliminated and a quinone formed: /NH2p-CcH/ XNH2 . 7NH9 Xp-C6H4< —^ C6H4Oa 7NH, /p-C6H4<( xSO,,H From these methods of formation it follows that the two quinone-oxygen atoms are in the para position to each other. The quinonereaction can be used in doubtful cases to decide whether a compound R 242 SPECIAL PART belongs to the para series. The quinones can also be obtained veryeasily from p-dioxy-compounds as well as from the p-sulphonic acidsof mon-acid phenols : /OHp-C6H4< + O = C6H402 + H20 p-C6H4< OHOH CGH402. Two formulae for the quinones have been proposed — the Peroxide-and Ketone-formula: O HC C CH HCv JCP -O

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