in water passing N2O3 into concd. aq. soln. of semicarbazide until satn.; cooling with ice; extn. with ether; repeated washing of ethereal soln. with water;
参考文献
Curtius, T.; Heidenreich, K.
J. Prakt. Chem. (2), 1895 , vol. 52, p. 454 - 489
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Gmelin Handbook: C: MVol.D1, 44, page 387 - 389