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