1 - -3.5-diphenylformazane

Synthesis of 3-Cyano-l,5-diphenylformazan (32). 35 A solution of 18.8g of aniline in 100ml of 6M hydrochloric acid was diazotized at... 

Ethyl formate34,52 or orthoformate5 3,54 reacts with two equivalents of phenylhydrazine to yield 1,5-diphenylformazan (11) the reaction takes place under acidic conditions and involves an oxidation. Under basic conditions, ethyl nitrate reacts at the methylene position to yield 3-methyl-1,5-diphenylformazan (37) which can also be obtained from the reaction of phenyl-azoethane (38) with isoamyl nitrite (Scheme 4).8,68 Aryl hydrazines react with a variety of s-triazines (39) to yield 1,5-diaryl formazans with hydrogen, methyl, or phenyl groups in the 3-position as in 40 (Eq. 6).56 Hydrazines have also been reported to react with benzotrichloride55,658 and sym-diamino tetrazine659 to yield formazans. 

The dianil complexes (190) have been prepared. Potentially bidentate 1,3,5-triphenylformazan and potentially terdentate l-(2 -carboxyphenyl)-3,5-diphenylformazan and l-(2 -hydroxyphenyl)-3,5-diphenylformazan are stoi-cheiometrically oxidized to the corresponding tetrazolium salts by CUCI2 in... 

N,N -Diphenylformazan-C-Carboxylic Acid or N, N Diphenylformazyl Formic Acid (For mazylameisensaure in Ger),... 

Mercapto-l,5-diphenylformazan (dithizone, dzH) (42) was first prepared by Emil Fischer over a century ago.146 In 1925 Hellmut Fischer147 introduced dithizone as a versatile analytical reagent and subsequently explored its use for the solvent extraction and quantitative determination of a number of metals of industrial and toxicological interest. The conditions for the isolation and... 

Copper and nickel complexes of the tridentate l-(2-carboxyphenyl)-3,5-diphenyl- (169 X = C02 R = R = Ph) and 1-(2-hydroxyphenyl)-3,5-diphenyl-(169 X = 0 R = R = Ph) formazans were prepared118 by the interaction of the formazan and the appropriate metal acetate in alcohol and were assigned the three-coordinate structures (170 X = O, C02 R = R = Ph M = Ni, Cu) since the diamagnetic nickel complexes were found to be unimolecular in benzene solution. Treatment of the nickel complex (170 X = O, R = R = Ph M = Ni) with pyridine gave a violet crystalline adduct which was assigned the four-coordinate structure (171 X = O R = R = Ph M = Ni). A product similar to the latter could not be obtained from the nickel complex of l-(2-carboxyphenyl)-3,5-diphenylformazan but nickel complexes of this type were obtained from both l-(2-hydroxyphenyl)- (169 X = O, R = CN R = Ph) and l-(2-carboxyphenyl)- (169 X = C02 R = CN R = Ph) 3-cyano-5-phenylformazans. In all three cases a considerable shade change occurred on going from the three-coordinate complex to the pyridine adduct. 

Burns, G. R., Cunningham, C. W. and McKee, V. (1988). Photochromic formazans Raman specta, X-ray crystal structure and C magnetic resonance spectra of the orange and red isomers of 3-ethyl-l,5-diphenylformazan J. Chem. Soc., Perkin Trans. II, 1275-80. [216]... 

Reaction of the dialdehyde with phenylhydrazine gave a derivative which formed an amorphous diphenylformazan (which, further, gave a monoacetate). Structure (55) was proposed for the formazan. Reaction of the dialdehyde with (p-nitrophenyl) hydrazine gave an amorphous mono-hydrazone, which was hydrolyzed by acid to glyoxal bis[(p-nitrophenyl)-hydrazone) and glycerose (as pyruvaldehyde). Structure (56) was assigned... 

The reaction of phenylhydrazine with oxysucrose was found to be similar to that described for oxidized monosaccharide derivatives above, as only two molecules of the base reacted with the four potential aldehyde groups the product was assigned structure (89). Mester found that this derivative forms an amorphous bis(diphenylformazan) with benzenediazonium chloride, and so he assigned structure (90) to it. Acetylation of the formazan gave an amorphous product, identical with the formazan prepared from... 

Oxycellulose and phenylhydrazine gave a yellow compound, which formed a diphenylformazan, showing that the oxycellulose had reacted in one of the two possible hemiacetal forms. Aminophenols and oxycellulose gave derivatives which coupled with diazonium compounds, enabling chemically colored fibers to be prepared. Reduction of oxycellulose oxime with lithium aluminum hydride, sodium borohydride, or sodium amalgam gave an amino-oxycellulose (109) in which up to 25 % of the oxime groups had been reduced. ... 

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