P- Diaminobenzene

These additives can have essentially a reductive character such as the Zn powder or a radical trapping character such as p-dinitrobenzene, triphenylphosphine, p-diaminobenzene, di-tertiobutylphenol or both characters in the case of hydroquinone. 

TMPD (k = 5.2 x 108 M 1s 1), p-diaminobenzene (k = 5 x 107 M 1s 1) and diphenylamine (k = lx 107 M 1 s 1) can all be readily converted into the corresponding radical cation by oxidation with pulse radiolysis generated SC>3 . With higher redox potential amines such as aniline and A. /V-dimethylandinc the oxidation to the radical cation fails32. Rate constants have also been measured for conversion of the same amines... 

Developer 13, see p-Phenylenediamine Developer P, see 4-Nitroaniline Developer PF, see p-Phenylenediamine Devicarb, see Carbaryl Devikol, see Dichlorvos Devol orange B, see 2-Nitroaniline Devol orange R, see 3-Nitroaniline Devol orange salt B, see 2-Nitroaniline Devol red GG, see 4-Nitroaniline Devoran, see Lindane Devoton, see Methyl acetate Diacetone, see Diacetone alcohol Diacetonyl alcohol, see Diacetone alcohol Diakon, see Methyl methacrylate Dialene 6, see 1-Hexene 1,4-Diaminobenzene, see p-Phenylenediamine p-Diaminobenzene, see p-Phenylenediamine 4-Diaminodiphenyl, see Benzidine p-Diaminodiphenyl, see Benzidine 4,4 Diaminobiphenyl, see Benzidine p,p -Diaminobiphenyl, see Benzidine 4,4 -Diamino-l,l -biphenyl, see Benzidine 4,4 -Diamino-3,3 -dichlorobiphenyl, see 3,3 -Dichloro-benzidine... 

Since the methyl group of TNT is attached to a picryl group, we should expect it in some respects to resemble the methyl group of a ketone. Although acetone and other methyl ketones bromi-nate with great ease, TNT does not brominate and may even be recrystallized from bromine. The methyl group of TNT, however, behaves like the methyl group of acetone in certain condensation reactions. In the presence of sodium carbonate TNT condenses with p-nitrosodimethylaniline to form the dimethylaminoanilide of trinitrobenzaldehyde,33 from which trinitrobenzaldehyde and N,N-dimethyl-p-diaminobenzene are produced readily by acid hydrolysis. 

Kevlar, a nylon polymer prepared by the reaction of 1,4-benzenedicarboxylic acid (terephthalic acid) with p-diaminobenzene, is so strong that it s used to make bulletproof vests. Draw the structure of a segment of Kevlar. 

Monoiminophosphines. As illustrated in Scheme II, PCHO condenses with a wide variety of simple and functionalized monoamines. Studies of the Mo(O) derivatives of several of these ligands demonstrate that they efficiently displace CO from Mo(CO)e affording (chel)Mo(CO)4 or fac-(chel)Mo(CO)3 derivatives (4). Similar, but bimetallic, complexes can be obtained from the ligands prepared by condensations with nonchelating diamines such as m- or p-diaminobenzene. 

P NMR spectra e.g. the derivatives of aniline, o-, m- and p-diaminobenzene and 1,2-diaminoethane246. 31P NMR evidence points to three equivalent P atoms in complex cation 75 (item N-4 of Table 2). This was interpreted as the quinolinyl group freely rotating around the N—C(g) axis. Also the four P atoms of complex 76 in solution are equivalent, suggesting that the N atoms change their coordination from one Au atom to another at a fast rate relative to the NMR time scale181. 

SYNONYMS p-aminoaniline, 4-aminoaniline, p-benzenediamine, 1,4-benzenediamine, p-diaminobenzene, 1,4-diaminobenzene, 1,4-phenylenediamine. 

Synonyms/Trade Names 4-Aminoaniline 1,4-Benzenediamine p-Diaminobenzene 1,4-Diaminobenzene 1,4-Phenylene diamine ... 

Poly(amide)s (PA)s that bear the sulfone group in the backbone have been described." These types of PA, which are based on 4,4 -bis-((3-carboxy-phenoxy)(p-benzoyl))-phenyl sulfone, c.f. Figure 7.7, or the corresponding 4-carboxy acid component" is amidized by an aromatic diamine, e.g., p-diaminobenzene. The direct polycondensation of a dicarboxylic acid with aromatic diamines uses triphenyl phosphite and pyridine. The introduction of m-structures increases the solubility of the polymers and leads to... 

Diaminobenzene. See p-Phenylenediamine m-Diaminobenzene. See m-Phenylenediamine o-Diaminobenzene. See o-Phenylenediamine p-Diaminobenzene. See p-Phenylenediamine... 

Diaminobenzene dihydrochloride p-Diaminobenzene dihydrochloride. See p-Phenylenediamine dihydrochloride... 

Synonyms 4-Aminoaniline dihydrochloride p-Aminoaniline dihydrochloride 1,4-Benzenediamine dihydrochloride p-Benzenediamine dihydrochloride Cl 76061 Cl oxidation base 10A 1,4-Diaminobenzene dihydrochloride p-Diaminobenzene dihydrochloride Oxidation base 10A p-PDA HCI... 

Harris and co-workers [79] studied seven systems and found their best results were with either o-diaminobenzene/LiC104 or p-diaminobenzene/tetraethylammonium tetra-fluoroborate (C8H20B4N) and they could improve the interfadal shear strength of Enka HTA-3000 by 46% over the value for the untreated fiber. 

Scheme 8.2. Polymerization mechanisms of a p-diaminobenzene and terephthaloyl dichloride to get PPTA [31...

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