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MUREBIDE (NH4.C8H4N506,H2O)

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Originally appearing in Volume V19, Page 34 of the 1911 Encyclopedia Britannica.
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MUREBIDE (NH4.C8H4N506,See also:H2O) , the ammonium See also:salt of purpuric See also:acid. It may be prepared by See also:heating See also:alloxantin in See also:ammonia See also:gas to Too° C., or by boiling uramil with mercuric See also:oxide (J. v. See also:Liebig, F. See also:Wohler, See also:Ann., 1838, 26, 319), 2C4H5N303+0= NH4•C5H4N506+H20. W. N. See also:Hartley (Jour. Chem. See also:Soc., 1905, 87, 1791) found considerable difficulty in obtaining specimens of murexide sufficiently pure to give concordant results when examined by means of their absorption spectra, and consequently devised a new method of preparation for murexide. In this See also:process alloxantin is dissolved in a large excess of boiling See also:absolute See also:alcohol, and dry ammonia gas is passed into the See also:solution for about three See also:hours. The solution is then filtered from the precipitated murexide, which is washed with absolute alcohol and dried. The salt obtained in this way is in the anhydrous See also:state.

It may also be prepared by digesting alloxan with alcoholic ammonia at about 78° C.; the See also:

purple solid so formed is easily soluble in See also:water, and the solution produced is indistinguishable from one of murexide. On the constitution of murexide see also 0. See also:Piloty (Ann., 1904, 333, 30) ; R. Mohlau (Ber., 1904, 37, 2686) ; and M. Slimmer and J. Stieglitz (Amer. Chem. Jour., 1904, 31, 661).

End of Article: MUREBIDE (NH4.C8H4N506,H2O)

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