380.29, N 36.83%. Two isomers are known: Bis(a-azido-3-nitro-benzylidenebazine(ca\led Di-m-nitrobenzhydrazidazid in Ger), fine yel crysts, explg mildly ca 156°; fairly sol in chlf; difficultly sol in eth or ale. Was prepd by treating an ale soln of bis(a-chloro-3-nitro-benzylidene) -azine with Na azide(Ref 2,pp 327 & 337-8)

and Bis(a-azido-4-nitro-benzylidene)-azine(cailed Di-p-nitrobenzhydrazidazid in Ger), red-yel crysts explg mildly ca 161°. Was prepd by treating an ale soln of bis(a-chloro-4-nitro-benzylidene>azine with Na azide. As a by-product of this reaction, there was obtained a small quantity of a product which exploded violently ca 149°. Its structure was not established(Ref 2,pp 327 & 335-6) Refs: l)Beil-not found 2)R.Stolle et al,JPrakt-Chem 137,327 & 335-8(1933) & CA 27,4233(1933)

Bis(a»azidobenzylidene)«hydrazine(called Dibenz-hydrazidazid in Ger),

C6H5.C(N3):N.N:C(N3).C6HS; mw 290.28, N 38.60%; long, fine ndls(from CC14), mp 139°(dec), expl when heated in an open flame; readily sol in chlf, CCI4, ligroin or hot benz; mod sol in warm eth; diffc sol in MeOH or ale; insol in w; was prepd by treating bis-(a-chlorobenzylidene)-hydra-zine with 2 mols of Na azide in MeOH and boiling for 16hrs in a C02 atm

Refs: l)Beil 9,[219] 2)R.Stolle & A.Netz.Ber 55,1301(1922) & CA 16,3899(1922)

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