4,4 -dinitro-3,3 -azobis

Dinitro-p-azostilbene or Azobis (3-nitro stilbene, called in Ref 2 3,3,-Dinitro-4/4 -distyryl-azobenzene, CjHg-CHiCH--QHsfNO NrN-QH NOJ-CHiCH-QH, carmine-red crysts mp 260-1°. Prepn and props are given in Ref 2... 

Di jiifro-2f2 osoRophthole ns (c ailed 2,2 -azobis [4-nitronaphthalene in CA) brn-red crysts, mp 315°. Prepd from the action of hydrazine in ale on l-chloro-2,4-dinitro-naphthalene, warmed 6 hrs on a w bath. The product was a mixt of the dinitro compd, the di-NH4 salt of 2,4-C10H6(NO2)2, m-nitro-naphthylazimidole and some 2,4-dimtro naphthalene. The reaction of anhyd hydrazine with l-chIoro-2.4-dinitronaphthalene gave only the 4,4 -dinitro-2,2 -azonaphthaiene and 2,4-dinitronaphthalene (Refs 1 2)... 

Dinitro-p-azostilbene or Azobis-(9-nitrostilbene, called in Beil Bis-[4 -nitro-stilbenyl-(4)]-diimid or [4 -Nitro-stilben]-<4azo4>-[4,-nitro- stilben], (OjN KAf- CH CH— C6H4-N N-C6H4-CH CH-CsH4(N01) yel-red Crystspmp 263°. It is listed in Beil 16, 84 without reference to its source was not found in CA through 1956... 

Dinitroozoonisole or 4,4 -AzobiS (3-nitroonisolo), CH,-0-C H,(N02)>N N-(N0,)C H, 0 CH mw 332.27, N 16.86% bright orn prisms (from nitiobenzene), mp 259°. It was prepd by diazotizing 3-nitro p-anisidine, 0,N(CH,0)C4H,NHi, and treating the diazonium soln with aq CuOH. This action yielded 2,2 —dinitro p,p -bisanisole and a considerable amt of the azobisnitro-anisole obtained from the acetic acid insol resid ie. See also Ref 2 for prepn by oxidation of 4-methoxy2>nitroaniline Refs DW.CLothrop, JACS 64, 1700(1942)... 

Nitration of 5-methoxyquinoxaline with potassium nitrate in concentrated sulfuric acid gives the 6,8-dinitro derivative, and the 6-methoxy compound is converted to 5-nitro-6-methoxyquinoxaline with these reagents. Nitration of 6-p-toluenesulfonamidoquinoxaline in acetic acid also gives a 5-nitro derivative. 6-Methylquinoxaline is brominated in the side chain when treated with N-bromosuccinimide in the presence of azobis-isobutyronitrile, and 6-bromomethylquinoxaline is obtained. " ... 

Primary alkyl phenyl tellurides undergo elimination to form terminal olefins in high yields on treatment with an excess of iV-chloro-iV-sodio-4-methyl-benzenesulphonamide (chloramine-T) in refluxing THF/ ufc-Dinitro compounds and /3-nitrosulphones are converted into olefins via free-radical elimination processes on treatment with tributyltin hydride in the presence of catalytic quantities of azobis(isobutyronitrile) (AIBN). Elimination from the dinitro compounds shows no stereocontrol by contrast, elimination from /3-nitrosulphones is highly stereoselective, e.g. (26)- (27), presumably because elimination from the intermediate radical is faster than rotation about the central carbon-carbon bond. 

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