2.6- Diphenyl-3-phenylazo

Diphenyl-5-quinoxalinamine with diazotized o-chloroaniline gave 8-o-chloro-phenylazo-2,3-diphenyl-5-quinoxalinamine (302) [substrate, 0-CIC6H4N2CI (prepared in situ), EtOH, H2O, <5°C, 30 min 90%) 2,3-diphenyl-6-quinoxalinamine likewise gave 5-o-chlorophenylazo-2,3-diphenyl-6-quinox-alinamine (303) ( 90%) and many analogs of both types were made similarly. ... 

Bis(phenylazo)phenanthrene 174, for which the cyclic form 175 dominates reactivity at low concentrations, reacts with acrylonitrile in dry toluene at 55 °C for 48h to give the o o-adduct 2,4-diphenyl-3a,6a-(biphenyl-2,2 -yl)-6-exo-cyano-l,3a,4,5,6,6a-hexahydropyrrolo[2,3-r7 -2,3-triazol-2-ium-l-ide 176 (60% ) as the only product of cycloaddition. Reaction with other alkenes, for example, A -phenylmaleimide, leads to a mixture of endo- and o ti-products, cf. 177 and 178 <1996J(P1)1623>. 

Di(phenylazo)-amine [called T.5-Diphenyl pentazdien-(l.4) or Bisdiazobenzolamid in Ger]... 

Diphenyl-5-phenylazo-4-(rifluo-romethyl- EIOb2. 120 (Bis-hydrazon/BF3)... 

Bis(phenylazo)-glycine and Derivatives N,N -Bi s(phenyl azo)-glycine[called Bis(benzene diazo)-glycocoll in CA Ref and Bis(benzol-diazo)-glykokoll or Diphenyl-pentazdien-essig-saure in Gerl,... 

A novel acid-catalysed rearrangement of 2-hydroxy-2-phenylazo-y-butyrolactone (45) to the interesting /V-substituted tetrahydro-l,3-oxazine-2,4-dione derivative (46) has been reported.58 The photo- and thermo-chemistry of diazo(2-furyl)methane and diazo(3-furyl)methane have been investigated59 using matrix isolation techniques, and 3,7-diphenylpyrano[4,3-c]pyran-l,5-diones have been prepared60 from 5,5 -diphenyl-... 

Like its sulfur and selenium analogs, 2,6-diphenyl- 1,4-ditellurofulvene 2 on treatment with amyl nitrite and phenyldiazonium tetrafluoroborate undergoes electrophilic substitution at the terminal methine carbon, giving rise to the corresponding nitroso and phenylazo derivatives (81CC828). 

Synonyms Anilinoazobenzene Benzeneazoanilide Benzeneazoaniline DAAB Alpha-Diazoamidoben-zol p-Diazoaminobenzene 1,3-Diphenyltriazene 1,3-Diphenyl-l-triazene DPT N-(Phenylazo) aniline Diazobenzeneanilide p-Diazoaminobenzene... 

The addition of 2,5-dihydro-2,3-diphenyl-l//-tetrazolium-5-thiolate to 2,3-diphenylcyclo-propenethione in refluxing benzene gave 4,6,7-triphenyl-2-phenylazo-l,3,4-thiadiazepine-5(4//)-thione in 21% yield. 

Diphenyl-2-phenylazo-l,3-thiazol (Schmp. 150°) ist aus 2-Brom-l,2-diphenyl-l-oxo-ethan mit Thiokohlensaure-hydrazid-(2-phenyl-hydrazid) unter Ahspaltung einer Amino-Gruppe zu 51% zuganglich1209 ... 

Oxidation of 2-(phenylhydrazino)-5,6-diphenyl-6//-l,3,4-thiadiazine with 30% hydrogen peroxide furnishes the 2-phenylazo compound in 65% yield <89ZC288>. 

Finally, in strongly alkaline solution formazans containing removable substituents such as COOH, COCH3, and COCOOH in position 3 can couple with a third diazonium component, giving the so-called 3-(phenylazo)form-azans for instance, l,5-diphenyl-3-(phenylazo)formazan, C6H5NH—N=C-(N=NC6H5)2, is obtained as end-product of complete coupling of acetone,344 acetaldehyde,344 351 354 pyruvic acid,344 351 acetoacetic acid,344 352 malonic acid,343 or acetonedicarboxylic acid,343 etc. 

---