Reaction CXXX.—Formation of Amino Guanidine Derivatives

Reaction CXXX. Formation of Amino Guanidine Derivatives.—Amino guanidine combines with aldehydes and ketpnes in the presence of a mineral acid. 

Many of the resulting compounds form crystalline picrates, and are isolated as such. The compounds with aromatic aldehydes are isolated as difficultly soluble nitrates. 

Reaction CXXXl. Formation of Semioxamazones.—Semioxamazide, NH2.CO.CO.NH.NH2, possesses similar properties to semicarbazide, and reacts well with aldehydes, but with ketones the reaction does not seem to be generally applicable. 

The aldehydes or ketones and the semioxamazide are weighed in molecular proportions, and when the former are insoluble in water it is best to dissolve them in a small quantity of alcohol. The semioxamazide, dissolved in the minimum quantity of water, is then added and the mixture thoroughly shaken for some time, when a precipitate of the semi- 

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