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NH2 OC

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Originally appearing in Volume V22, Page 760 of the 1911 Encyclopedia Britannica.
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NH2 OC .R' ~N : C•R' In a similar manner, diamino derivatives are formed when See also:cyanogen is condensed with ortho-diamines, and these amino compounds readily pass into the corresponding dioxy derivatives when acted upon with dilute hydrochloric See also:acid. The quinoxalines are weak bases, and are See also:stable towards oxidizing agents but are readily reduced to hydro derivatives. The tetrahydroquinoxalines are formed by condensing ortho-diamines with ortho-dihydroxy benzenes, and the keto-dihydro derivatives arise similarly by condensing mono-alkyl diamines with ketonic acids (Kehrmann and Messinger, Ber., 1892, 25, pp. 1628 et seq.). The azonium bases (See also:formula II.) of this See also:series are produced when the dihydroquinoxalines (obtained by similar condensations from the mono-alkyl-ortho-diamines) are oxidized with ferric chloride. N: C•R' N: />13, II. Azonium bases.

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