Hydrazine tetraphenyl

Nitrosamine reagieren mit Pentacarbonyleisen zu sek. Aminen. So erhalt man z.B. aus N-Nitroso-diphenylamin in Isooctan 52%d.Th. Tetraphenyl-hydrazin und27% d.Th. Diphenylamin, wahrend mit Dibutylather als Losungsmittel ausschlieBlich Diphenylamin (91% d.Th.) erhalten wird4 ... 

Chemical/Physical. Reacts with strong acids forming water-soluble salts. Also reacts with potassium permanganate forming tetraphenyl hydrazine (Zbozinek, 1984). In water, diphenylamine reacted with OH radicals at a rate of 4.9 x lO /M-h at 25 °C (Armbrust, 2000). 

The rate constant of this reaction was measured by flash photolysis with tetraphenyl-hydrazine as a source of diphenylaminyl radicals [64]. Peroxyl radicals were generated through the photodecay of bis(l,l-dimethylethyl) peroxide followed by the rapid reaction of formed alkoxyl radicals with cyclohexane used as a solvent the reaction conditions were chosen in such a way that [R02 ]o > [Ph2N ]0. Under these conditions, aminyl radicals were destroyed only in the reaction with peroxyl radicals and, hence, the concentration of peroxyl radicals during the measurement of the kinetics of Ph2N consumption varied insignificantly. The rate constant of the recombination of peroxyl and diphenylamine radicals was found to be equal to 6 x 108 L mol 1 s 1 (cyclohexane, 283-303 K). 

Hydrazine has been found to give similar reactions. Thus a mixture of p-toluoin and hydrazine hydrate, when heated on a steam bath, has been found to give tetra-p-tolylpyrazine (20) and p-toluoin hydrazone (19) the latter on heating at 185° gave the former (268). Heating of benzoin hydrazone at 110° also gave tetraphenyl-... 

Diamino-2-phenyltriazole and nitrosobenzene, stirred in an emulsion of benzene and 12 N sodium hydroxide, gave 4-amino-2-phenyl-5-phenylazotriazole (60°C, 10 min, 72%) (70BCJ3587). Potassium permanganate in dilute acetic acid oxidized 4-amino-3,5-diphenyltriazole to 3,3, 5,5 -tetraphenyl-4,4 -azotriazole (25 °C, 30%). This product, stirred with hydrazine hydrate and palladized carbon in chloroform, gave 4-amino-3,5-diphenyltriazole (25°C, 1 hr, 91%) (70JOC2215). 

Keywords gas-solid reaction, oxidative coupling, diphenylamine, tetraphenyl-hydrazine... 

Diphenylaminyl radicals, In, produced in tetraphenyl-hydrazine decomposition, react with the formation of diphenyl amine and oligomeric semidienes. Diphenyl amine is formed in the reaction of In with labile dimers, AmAm, with iminoquinone structure. The rate constant of Am recombination measured by flash photolysis technique (FTP) was found to be 1.8x10 l.mole s (cyclohexane, 293°K). The combination of In and ROj was studied by FPT using monitoring at two different avelengt s. It runs with the rate constant of 6x10 l.mole s (cyclohexane,... 

RuAuFjOPjCjjHgj, Ruthenium(l-t-), car-bonyldi-n-hydrido-tris(triphenylphos-phine) (triphenylphosphine)gold]-, hexafluorophosphate(l—), 29 281 RuAujFgPgCgoHjg, Ruthenium(l-t-), tri-p-hydrido-tris(triphenylphos-phine)bis[(triphenylphosphine)gold]-, hexafluorophosphate(I -), 29 286 RuBjNgCjoHjg, Ruthenium(II), (V-1,5-cyclooctadiene)tetrakis(methyl-hydrazine)-, bis(tetraphenyl-borate(l—)), 26 74... 

The intermediate diarylnitrogen radicals obtained are substantially less stable than the corresponding azotoxides, and readily recombine and disproportionate. The primary diphenylnitrogen radicals cannot be detected by the EPR method even in the thermal dissociation of tetraphenyl-hydrazine under vacuum. However, the corresponding azotoxides are extremely stable. Figure 38 presents the EPR spectrum of diphenyl-azotoxide (IX), produced in the catalytic decomposition of hydroperoxides in the presence of diphenylamine. 

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