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must be manufactured in such a way that they are effectively sealed.

Kast and Haid have determined the temperatures at which cyanuric triazide and certain other initiators explode spontaneously, both by raising the temperature of the samples at a constant rate and by keeping the samples at constant tem|>eratures and noting the times which elapsed before they exploded. When no measurable time elapsed, the temperature was "the temperature of instantaneous explosion." Their data are especially interesting because they show the rate of deterioration of the materials at various temi>cratures.44

Trinitrotriazidobenzene l,3,5-Trinitro-2,4.6-triazidobenzene by the reactions indicated below.

NH, is prepared from aniline

Trinitrotriazidobenzene l,3,5-Trinitro-2,4.6-triazidobenzene by the reactions indicated below.

NO,

Trtnltro-trlazldobeozeoa ci ci

Aniline is chlorinated to form trichloroaniline. The amino group is eliminated from this substance by means of the diazo reaction, and the resulting ay/n-trichlorobenzcne is nitrated. The nitration, as described by Turek, is carried out by dissolving the material in warm 32% oleum, adding strong nitric acid, and heating at 140-150° until no more trinitrotrichlorobenzene, m.p. 187°, precipitates out. The chlorine atoms of this substance are then replaced by azido groups. This is accomplished by adding an acetone solution of the trinitrotrichlorobenzene, or better, the powdered substance alone, to an actively stirred solution of sodium azide in moist alcohol. The precipitated trinitrotriazidobenzene is filtered off, washed with alcohol and with water, and, after drying, is sufficiently pure for technical purposes. It may be

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