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WERNER : TRE CONSTITUTION OF CARBAMIDES. PART IX. 1093 XCIV.-The Constitution of Carbaniides. Part I X. The Interaction of Nitrous Acid and Mono-substituted Ureas. The Preparation of Diaxomet hane, Diazoethane, Diazo-n-but ane, and Diazoisopen t ane from the Respective Nitrosoureas. By EMIL ALPHONSE WERNER. NITROSOMETHYLUREA, obtained by von Bruning (Ber., 1888, 21, l809), was the first example of the preparation of a nitroso-derivative from a mono-substituted urea, and its formation has been supposed to take place in accordance with the equation NR,*CO*NH*CH, + HNO, = NH,*CO*N(NO)*CR, + H,O. Later, nitrosophenylurea, and the corresponding m-and p-tolyl and B-naphthyl derivatives, were prepared by Walther and Wlodkowski (J. p. Chem., 1899, [ii], 59, 285). Assuming the carbamide configuration, it must be admitted that the formation of a nitrosederivative is rather surprising and requires some explanation, since it would be natural t o expect that the amino-group would be a t once attacked with complete decomposition of the urea, thus: (a) NH,*CO

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