Benzene, triazo

Bis(triazo) benzene. Same as Diazidobenzene, described under Azido and Azidonitro Derivatives of Benzene... 

In connection with the hydrolysis of benzoylazide, it is interesting to recall that triazo-benzene or phenylazide, C H6N4, is so stable that it cannot be directly hydrolyzed by the action of acids on alkalies to form hydrazoic acid, but E. NSiting and E. Grandmougin were able to show that if an acidic radicle, say a nitro-group, be introduced into the phenyl radicle—say by treatment with nitric acid whereby p-nitrophenylazide, C,H., N02)N3, is formed—the product is readily hydrolyzed by alkali-lye. Similar remarks apply to the ortho-derivatives, while, curiously enough, the meta-derivatives are not so readily hydrolyzed. 

The preceding compound (5 grams) is warmed with 12 grams of di-methylaniline a blue condensation product separates out. This is dissolved in 20 c.c. of hot acetic acid, the solution filtered and the filtrate treated with ether, when the required dye separates in blue flocks. If the dinitroso-com2)ound is reifiaced by 3-nitro-4-triazo-phenylarsinic acid, the same product is obtained. The dye is very sjjaxingly soluble in water, ether, and benzene, moderately soluble in sodium carbonate, readily soluble in alcohol, acetic acid, and sodium hydroxide. 

Photolysis of l-ethoxycarbonyl-5, 5-dimethyl-3-phenyl-A2-l,2,4-triazo-line (Scheme 32) in benzene in the presence of oxygen and methyl triflu-oroacetate gives the 5-methoxy-2,2-dimethyl-4-phenyl-5-trifluoromethyl-... 

---