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FURAZANES (furo—a.a'—diazoles)

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Originally appearing in Volume V11, Page 357 of the 1911 Encyclopedia Britannica.
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FURAZANES (furo—a.a'—diazoles) , organic compounds obtained by See also:heating the glyoximes (dioximes of ortho-See also:diketones) with alkalis or See also:ammonia. Dimethylfurazane is prepared by heating dimethylglyoxime with excess of ammonia for six See also:hours at 165° C. (L. See also:Wolff, Ber., 1895, 28, p. 70). It is a liquid (at See also:ordinary temperature) which boils at 156° C. (744 mm.). See also:Potassium permanganate oxidizes it first to methylfurazanecarboxylic See also:acid and then to furazanedicarboxylic acid. Methylethylfurazane and diphenylfurazane are also known. By warming oxyfurazane acetic acid with excess of potassium permanganate to roo° C. oxyfurazanecarboxylic acid is obtained (A. Hantzsch and J. Urbahn, Ber., 1895, 28, p.

764). It crystallizes in prisms, which melt at 175° C. Furazanecarboxylic acid is prepared by the See also:

action of a large excess of potassium permanganate on a hot See also:solution of furazanepropionic acid. It melts at 107° C., and dissolves in See also:caustic soda, with a deep yellow See also:colour and formation of nitrosocyanacetic acid (L. Wolff and P. F. Ganz, Ber., 1891, 24, p. 1167). Furoxane is an See also:oxide of furazane, considered by H. See also:Wieland to be identical with glyoxime peroxide; See also:Kekule's dibromnitroacetonitrile is dibromfuroxane. The formulae of the compounds above mentioned are: HC: N CH3•C: N>0 HC : N>O H:N CHa C: N HO2C•C: N Furazane. Dimethyl- Furazane- furazane. carboxylic acid.

End of Article: FURAZANES (furo—a.a'—diazoles)

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