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Encyclopedia Britannica



NH2 OC

This article appears in Volume V22, Page 760 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: NEW-NUM
NH2 OC .R' ~N : CR'
In a similar manner, diamino derivatives are formed when
cyanogen
  is condensed with ortho-diamines, and these amino compounds readily pass into the corresponding dioxy derivatives when acted upon with dilute hydrochloric
acid
 .
The quinoxalines are weak bases, and are
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 (
formula
  II.) of this
series
  are produced when the dihydroquinoxalines (obtained by similar condensations from the mono-alkyl-ortho-diamines) are oxidized with ferric chloride.
N: CR' N:
/>13,
II. Azonium bases.


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