Diphenyl-p-phenylenediamine

Aq methacrylic acid (90%) was satd with NaCl (to remove the bulk of the water), then the organic phase was dried with CaCl2 and distd under vacuum. Polymerisation inhibitors include 0.25% p-methoxyphenol, 0.1% hydroquinone, or 0.05% A/,A/ -diphenyl-p-phenylenediamine. 

Paraphenylene-diamine derivatives A/,N -Diphenyl-p-phenylenediamine (IV) /V,A/ -Di-p-naphthyl-p-phenylenediamine (V) Yes Yes Powerful antioxidants. Have been used in a variety of plastics materials. Tendency to bloom, bleed and stain mitigates against more extensive use. Compound (V) now withdrawn by some suppliers. 

Figure lO.U. Oxidation of polyethylene in air at 105°C, Effect of adding 0.1% antioxidant on power factor. A, blank. B, /V,/V -diphenyl-p-phenylenediamine. C, 4,4 -thiobis-(6-butyl-m-cresol). D, Nonox WSP. E, N./V -di-pl-naphthyl-p-phenylenediamine... 

Photochemical syntheses have also been attempted for the preparation of in-dolocarbazoles. Thus when the N,N -diphenyl-p-phenylenediamines 188a-b underwent photocyclization in diethyl ether, formation of low yields of the products... 

When N,A/ -dimethyl-Af,N -diphenyl-p-phenylenediamine (231) underwent irradiation in die presence of oxygen, a remarkably regioselective reaction was observed, from which the /V,A/ -dimediylindolo[2,3-f ]carbazole (190) was obtained, without coformation of die other possible isomeric product, indolo[3,2-/)]carbazole (4). The expected intermediate 232, where only one ring closure had taken place, could not be detected. The authors attributed this fact to a two-photon autosensitization mechanism in which die conversion of 231 into 190 is sensitized by 232, permitting accumulation of 232 only in extremely small concentrations (83JA6268). 

Experimentally, the molecular geometry has been determined by X-ray analysis for several larger radicals. These data indicate, in agreement with the theory, that bond alternation characteristic in many reduced and oxidized closed-shell forms is diminished in radical ions. Precise crystallographic data are available for 4,4 -A/s(dimethylamino)diphenylamine radical cation (87, 88), N,N -diphenyl-p-phenylenediamine radical cation (89), and Wiirster s blue (90). 

Benzo[l,2-fl]-8-methyl-9-azaphenothiazinone (14) was reduced to a leuco form 15 which was too unstable to be isolable.10 The leucos 16 and 18 obtained from thionation of iV,iV-diphenyl-p-phenylenediamine and j9,//-dianilinodiphenylamine, respectively, are also air sensitive. 11 They are oxidized to thiazine dyes 17 and 19 which are reported to absorb in the near infrared. 

TERPHENYL p-TERPHENYL TRIPHENYLPHOSPHINE TRlPHENYL PHOSPHATE N,N -DIPHENYL-p-PHENYLENEDIAMINE 2,3-DIMETHYL-2,3-DIPHENYLBUTANE DICUMYL PEROXIDE n-DODECYLBENZENE HEXAETHYLBENZENE... 

Naturally, the cation-radical of diphenylamine is characterized with an analogous positive-charge delocalization (Liu and Lund 2005). The A,A -diphenyl-p-phenylenediamine cation-radical is almost planar and the spin density intrudes outer phenyls. When the outer phenyls contain two methyl groups in ortho positions, the molecule loses planarity. As a result, the spin density concentrates within the inner ring and its adjacent two nitrogen atoms (Nishiumi et al. 2004). 

Castro GD, Lopez AJ, Petricio AR, etal. 1986. Effect of the pretreatment with pyrazole, cystamine or diphenyl-P-phenylenediamine (DPPD) on the CCKpromoted pentane evolution in rats. Res Common Chem Pathol Pharmacol 52 137-140. 

N,N -Diphenyl-p-phenylenediamine [39529-22-1 ] M 260.3, m 148-149°. Crystd from chlorobenzene/pet ether or benzene. Has also been crystd from aniline, then extracted three times with absolute EtOH. 

A number of amines and phenols are known to be effective stabilizers - for rubber (2, 20). They are capable of protecting unsaturated polymers from the attack of oxygen and ozone, but the effects of the stabilizers on antioxidation and antiozonization are not always the same —e.g., N,N -diphenyl-p-phenylenediamine (A) is an antioxidant, whereas jV,N -phenylcyclohexyl-p-phenylenediamine (B) is an antiozonant. 

In vitro exposure of renal cortical slices to cephaloridine results in time- and concentration-dependent increases in lipid peroxidation, as reflected by malondial-dehyde production. Furthermore, the onset of cephaloridine-induced malondial-dehyde production preceded cephaloridine-induced inhibition of organic ion accumulation, suggesting that cephaloridine-induced lipid peroxidation mediates the effects of cephaloridine on organic ion transport. Additionally, antioxidants (e.g., promethazine, N, A -diphenyl-p-phenylenediamine) block the effects of cephaloridine on lipid peroxidation and on organic ion transport, suggesting a cause-effect relationship between cephaloridine-induced lipid peroxidation and inhibition of organic ion transport. 

SYNS AGERITE AGERITEDPPD N,N -DIFENYL-p-FENYLENDIAMIN (CZECH) DIPHENYL-p-PHENYLENEDIAMINE N,N -DIPHENYL-p-PHENYLENEDIAMINE DPPD FLEXAMINE G JZF NONOX DPPD p-PHENYLAMINODI-PHENYLAMINE 4-PHENYLAMINODIPHENYLAMINE USAF GY-2... 

C18H16N2 N,N -diphenyl-p-phenylenediamine 74-31-7 1.729E-I-10 151.160 33401 C22H38 1 -phenyl hexadecane 1459-09-2 2.837E+10 215.520... 

The condensation product obtained from arsenious chloride and N-N -diphenyl-p-phenylenediamine in boiling o-dichlorobenzene solution is oxidised to the arsinie acid, and this is reduced by the usual means, when the chloro-compound is isolated in orange-red, doubly refracting, prismatic needles, unmelted at 820° C. 

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