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To ; 1 2 3 4 r> 7 Orndoiff and Cauffman, Amer. Chem. , 1892, 14, 45.

For an account of this secondary reaction see p. ) Hausser and Muller 2 introduced method from the foregoing. an They heated entirely different solutions of various diazo-com pounds at fixed temperatures and measured the volume of nitrogen evolved. The decomposition belongs to the class of unimolecular processes, and is represented by the well-known expression By comparing the values of the constant obtained the relative stability of the cliazo-compounds may be determined. A constant value was obtained only in the case of the diazo-salts from sulphanilic acid and |7-toluidinesulphonic acid.

Epstein, D. R-P. 103660. , 1897, 30, 2901. , 1897, 30, 93. 6 E. P. 17546 of 1892. D. R-P. 103685. E. P. 18624 of 1900, D. R-P. 168299; derivatives of the latter, such as 2 4-diaminoanisole and 2 4-diaminophenetole, are also readily tetra5 7 : tised (D. R-P. 258653). : PREPARATION OF THE DIAZO-COMPOUNDS 25 In order to diazotise only one amino-group in sulphonated 7n-diamines, the solution of the base is mixed with the calculated quantity of alkali nitrite and then mineral acid added ; by this means the diamine is in contact always requisite quantity of free nitrous acid, with the and the diazotisation 1 proceeds smoothly.

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