Online Encyclopedia

AZOXIMES (furo [a.b.] diazoles)

Online Encyclopedia
Originally appearing in Volume V03, Page 86 of the 1911 Encyclopedia Britannica.
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AZOXIMES (furo [a.b.] diazoles), a class of organic compounds which contain the ring system NC Cg >O. They may be prepared by converting nitriles into amidoximes by the action of hydroxylamine, the amidoximes so formed being then acylated by acid chlorides or anhydrides. From these acyl derivatives the elements of water are removed, either by simple heating or by boiling their aqueous solution; this elimination is accompanied by the formation of the azoxime ring. Thus NH2OH boil with CaH6CN-->CsHs•C'NH2H —~ propioaic anhydride [CGH6C(.COC2H6] -'CBH5.G\N O>C C2Hs' Azoximes can also be produced from a-benzil dioxime by the " Beckmann " change. Most of the azoximes are very volatile substances, sublime readily, and are easily soluble in water, alcohol and benzene. For detailed descriptions, see F. Tiemann (Ber., 1885, i8, p. 1059), O. Schulz (Ber., 1885, 18, pp. 1084, 2459), and G. Muller (Ber.,i886,19, p.1492); also Annual Reports of the Chemical Society).
End of Article: AZOXIMES (furo [a.b.] diazoles)
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