1,2-Azidonitro derivatives

Contrary to other Af-oxide containing heterocycles, Bfx and Fx are not formed by direct oxidation of the parents systems, benzofurazan (Bfz) and furazan (Fz), respectively. Even though each kind of heterocycle possesses individual synthetic procedures, some common approaches should be mentioned, i.e., thermo or photochemical intramolecular cychzation of 1,2-azidonitro derivatives and oxidative cychzation of 1,2-dioximes. Some other synthetic procedures, such as oxidation of o-nitroanUines to Bfx or dimerization of nitrile oxides and dehydration of a-nitrooximes to Fx, have been depicted. The following sections provide the most recent descriptions. 

Azido and Azidonitro Derivatives of Benzene Azidobenzene(called Azidobenzol, Triazobenzol, Phenylazid or Diazobenzolimid in Get), C6Hg. Na mw 119.12, N 35.28% pale yel oil with odor like bitter almond mp expi on distn at normal press thermochem props(Ref 5) si sol in ale or eth in-soi in w. Many methods of prepn are iistea in Ref 1. Treatment with A1C13, in absence of solv, resuits in an expln(Ref 4)... 

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

Ethylbenzene or Phenylethane, C2H.5.C H5 mw 106.16 colorless liq, resembling methyl-benzene (toluene), sp gr 0.867 at 20/4°, nD 1.4959 at 20°, fr p -95-0°, bp 136.2°, fl p 85°F (29-5°C) sp heat 0.41cal/g, viscosity 0.64 centipoise at 25° heat of combstn at Cy 108.9kcal/fnole, heat of vaporization 81.1cal at bp very si sol in w (0.01% at 15°) v sol in ale, eth, benz chlf insol in Amm hydroxide. It can be prepd by heating benzene and ethylene in presence of A1 chloride with subsequent distillation, or by fractionation directly from the mixed xylene stream in petroleum refining. Purification is by rectification. It is used in org synthesis, as solvent diluent and for prepn of explosive azidonitro-, dinitro-, trinitro- higher nitrated derivatives... 

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