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20103-09-7

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Process for preparing p-phenylenediamines
A process for producing p-phenylenediamine or a derivative thereof which comprises reducing p-nitroaniline or a derivative thereof by hydrazine in the presence of an aromatic quinone compound or an aromatic dihydroxy compound.
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(2008/06/13)

ESR-Spectroscopic Investigations on the Radical Cations of p-Phenylene Diamines and Related Compounds. The Determination of the Various Spin Polarisation Parameters
The ESR-spectra of the radical cations of various p-phenylenediamines and related compounds were measured.The coupling constants were determined by use of specifically deuterated compounds, calculation of the autocorrelation function and spectra simulation.The calculation of spin densities were carried out using the Hueckel method and McLachlans's method (POL-2) modified for radical cations.After adjustment of the nitrogen perturbation parameters hN(NR2) to the protonic splitings it is possible to determine the QX-values from the calculated nitrogen spin densities and the measured coupling constants.On the basis of these calculations the spin polarisation parameters QX of nitrogen and protons in NH2 and NMe2 groups were determined by means of the McConnell and Karplus-Fraenkel equations. - Keywords: ESR-spectroscopy / p-Phenylenediamines / Spin polarisation parameters
Grampp, Guenter,Stiegler, Guenter
p. 185 - 200
(2007/10/02)

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Chemical Properties

Appearance/Colour :light brown to pinkish-grey powder
Melting Point: 164-166 °C (dec.)(lit.)
Boiling Point: 303.7 °C at 760 mmHg
Flash Point:137.5 °C
Density: 1.501 g/cm³
Storage Temp.:2-8°C
Vapor Pressure: 0.000916mmHg at 25°C
Refractive Index: 1.679
PKA: 3.16±0.10(Predicted)
BRN: 2803055
PSA: 52.04000
LogP: 3.32020

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