Category: 1821-27-8

Poliak, Peter published the artcileSubstitution and torsional effects on the energetics of homolytic N-H bond cleavage in diphenylamines, Application In Synthesis of 1821-27-8, the publication is Polymer Degradation and Stability (2015), 37-44, database is CAplus.

The systematic study of substituent effects and torsional deformation on the N-H bond dissociation enthalpies (BDE) in diphenylamine (DPA) and 33 mono-, 33 di- and 22 tetrasubstituted diphenylamines is presented. The DPA and its derivatives were studied by means of (U)B3LYP/6-311++G** quantum-chem. method. Calculated gas-phase bond dissociation enthalpies approximated from the total electronic energies are in very good agreement with available exptl. solution-phase data. The substitution in the ortho and para position(s) can considerably alter the N-H BDE. The largest N-H BDE decrease is caused by the hydrogen bond forming substituents (-OH, -NH₂) in the ortho positions and strong electron-donating groups placed in the para positions. Therefore, the improvement of the DPA antioxidant effectiveness, i.e. N-H BDE decrease, can be accomplished by the substitution in ortho or para position(s). The changes in mutual aromatic rings orientation in DPA mol. and studied derivatives affect the N-H BDE values considerably (increase by up to 28 kJ mol^-1). Hence, the mutual aromatic rings orientation alterations may induce neg. effect on the antioxidant ability of DPA based antioxidants. Presented results indicate that the deviations of the antioxidant activity in various solid-phase matrixes could have origin also in the mutual benzene ring orientation of the antioxidant mol.

Polymer Degradation and Stability published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Application In Synthesis of 1821-27-8.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Titova, I. A. published the artcileVicarious nucleophilic C-amination of nitrobenzene and 5- and 6-nitro-1-methylbenzimidazoles, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Russian Journal of Organic Chemistry (2005), 41(9), 1306-1315, database is CAplus.

Vicarious nucleophilic C-amination of nitrobenzene, 1-methyl-5-nitrobenzimidazole, and 1-methyl-6-nitrobenzimidazole in superbasic medium (potassium tert-butoxide-dimethyl sulfoxide) gave the corresponding amino-substituted derivatives The yield of the amination product of 1-methyl-5-nitrobenzimidazole considerably increased in the presence of CuCl. ESR monitoring of these reactions revealed formation of primary radical anions from the substrates. Possible reaction mechanisms are discussed.

Russian Journal of Organic Chemistry published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C10H10O2, Recommanded Product: Bis(4-nitrophenyl)amine.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Frumina, N. S. published the artcileUse of p-nitrodiphenylamine as a redox indicator for determining chromium in the presence of vanadium, Application In Synthesis of 1821-27-8, the publication is Zavodskaya Laboratoriya (1969), 35(11), 1297-9, database is CAplus.

Cr was titrated with (NH4)2Fe(SO4)2 in 3-4N H2SO4 and in the presence of V (Cr:V > 3:1) with 0.1% p-nitrophenylamine in 1:1 H2SO4 as a redox indicator. For the determination of V the optimum medium is 8-18N H2SO4. The method is suitable for the determination of Cr in alloy steels.

Zavodskaya Laboratoriya published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Application In Synthesis of 1821-27-8.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Kuett, Agnes published the artcileStrengths of Acids in Acetonitrile, Product Details of C12H9N3O4, the publication is European Journal of Organic Chemistry (2021), 2021(9), 1407-1419, database is CAplus.

The equilibrium acidity scale (pK_a scale) in acetonitrile has been supplemented by numerous new compounds and new ¦¤pK_a measurements. It now contains altogether 231 acids – over twice more than published previously – linked by 569 ¦¤pK_a measurements and spans between the pK_a values of hydrogen iodide (2.8) and indole (32.57), covering close to 30 orders of magnitude. Measurement results acquired over the last 15 years were added to the scale and new least-squares treatment was carried out. The treatment yielded revised pK_a values for the compounds published previously, with the root mean square difference between revised and previous values 0.04, demonstrating very good stability of the scale. Correlation equations were developed for estimating pK_a values for the studied types of compounds in water, DMSO, DMF, and 1,2-dichloroethane on the basis of pK_a values in acetonitrile. These equations enable predicting pK_a values with an average error around or less than 1 pK_a unit, which is a sufficient accuracy for many applications. The scale is expected to be a useful tool for the widest possible research areas in organic chem., electrochem. power sources, catalysis, etc.

European Journal of Organic Chemistry published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Product Details of C12H9N3O4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Halle, Jean C. published the artcileIonization of substituted nitroaromatic amines in aqueous dimethyl sulfoxide media. I. Poly(nitro)arylamines, Synthetic Route of 1821-27-8, the publication is Bulletin de la Societe Chimique de France (1973), 1225-30, database is CAplus.

The acidity constants (pKa) of 22 mono-, di-, and trinitroarylamines were determined in H2O-Me2SO. The pKa’s of mononitro amines decreased with increasing Me2SO content of the medium, but the pKa’s of dinitro and trinitro amines increased with increased Me2SO in the medium. These results indicate that the stabilizing influence of Me2SO on amide anions is greater as the charge is more delocalized.

Bulletin de la Societe Chimique de France published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Synthetic Route of 1821-27-8.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Espinoza, Edgard O’N. published the artcileCharacterization of smokeless gunpowder by means of diphenylamine stabilizer and its nitrated derivatives, Application In Synthesis of 1821-27-8, the publication is Analytica Chimica Acta (1994), 288(1-2), 57-69, database is CAplus.

Smokeless gunpowder frequently contains diphenylamine as a stabilizer. The diphenylamine acts as a nitrate scavenger and in turn is nitrated by complex processes. The various nitrated congeners of diphenylamine, which are numerous, may serve to characterize a sample of gunpowder because these derivatives reflect not only the production of the gunpowder, but also its storage career and thermal history following manufacture These derivatives of diphenylamine may be isolated and identified by means of thin-layer chromatog. and liquid chromatog.

Analytica Chimica Acta published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Application In Synthesis of 1821-27-8.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Hashem, M. A. published the artcileOne step N-arylation of amines catalyzed by a non-toxic copper complex, Product Details of C12H9N3O4, the publication is Bangladesh Journal of Scientific and Industrial Research (2017), 52(1), 53-60, database is CAplus.

A new, simple and efficient copper-catalyzed method using a non-toxic copper complex has been developed for arylation of aromatic and heterocyclic amines with aryl halides. The copper complex was prepared from N-Ph salicylaldimine and Cu₂Br₂ in methanol.

Bangladesh Journal of Scientific and Industrial Research published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Product Details of C12H9N3O4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Dolman, Douglas published the artcileAn acidity function in ethanol-sulfuric acid based on the protonation of diphenylamines, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Canadian Journal of Chemistry (1967), 45(9), 903-10, database is CAplus.

A Hammett H0 acidity function based on the protonation of 17 diphenylamines in 20 volume % EtOH-aqueous H2SO4 has been established. The H0 value for the most acidic solution studied (11.2M H2SO4) is -6.97. This acidity function differs from that based on the protonation of azobenzenes in the same solvent system; the latter diverges to more neg. H0 values as the sulfuric acid concentration increases. The pKBH+ values for the protonation of the diphenylamines vary from +1.36 for 4-methoxydiphenylamine to -6.21 for 4,4′-dinitrodiphenylamine. A plot of log KBH+ vs. the Hammett ¦Ò constants for five monosubstituted diphenylamines yields a ¦Ñ value of +3.36. The pKBH+ values for 4-methoxy-, 4-methyl-, 4-methylsulfonyl-, and 4-nitro-diphenylamine are all less (more neg.) than expected from the Hammett substituent constants The substituent effects on the basicities of aniline and diphenylamine are the same. The basicities of several nitro-substituted diphenylamines appear to vary regularly, and do not reflect the presence of a strong interaction between the nitro group and H2SO4. 43 references.

Canadian Journal of Chemistry published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Recommanded Product: Bis(4-nitrophenyl)amine.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Lopatina, N. B. published the artcileStudy of the effect of the intramolecular interaction of atomic groups through an intermediate link on the intensity of IR absorption bands in nitroaromatic compounds, Related Products of catalysis-chemistry, the publication is Zhurnal Prikladnoi Spektroskopii (1993), 58(5-6), 436-42, database is CAplus.

Integral intensities of IR absorption bands, corresponding to the antisym. and sym. valence oscillations of the N-O nitro group, in spectra of aromatic nitro compounds 4-O₂NC₆H₄MX are measured. The effect of intramol. interaction on the intensities via an intermediate link (M) between the nitro group and a substituent (X) is investigated. It is shown that this interaction influences the IR intensity in a manner similar to the vibrational frequency.

Zhurnal Prikladnoi Spektroskopii published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Vokin, A. I. published the artcileSolvatochromism of heteroaromatic compounds: XXVIII. Factors affecting the nonspecific solvatochromic effect in the UV spectra of aromatic nitro compounds in aprotic protophilic solvents, Product Details of C12H9N3O4, the publication is Russian Journal of General Chemistry (2006), 76(4), 596-614, database is CAplus.

Examination of the UV spectra of a large series of solvatochromic indicators of the general formula 1-X-4-NO₂-C₆H₄ in aprotic solvents confirmed the proportionality between the dipole moments of these compounds in the ground (¦Ì_g) and first electronically excited (¹A₁, ¦Ì_e) states: ¦Ì_e = r_¦Ì¦Ì_g. The coefficient r_¦Ì was determined by applying the equation of the Bakhshiev-Bilot-Kawski solvatochromism theory both to nonspecifically solvated mols. and to their H complexes with aprotic protophilic solvents. An anisotropy of the electron redistribution was revealed for low-symmetry 1-substituted 2,4-dinitrobenzenes. The r_¦Ì value obtained allowed the calculation of the Kamlet-Taft empirical solvatochromic parameter ¦Ð* on the basis of generalized characteristics of the solvent.

Russian Journal of General Chemistry published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C9H8BrF3, Product Details of C12H9N3O4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia