Abstract
The structure of a colored intermediate commonly formed in the oxidation of p-aminophenol at low pH is established by analysis of H NMR and UV/vis spectra, kinetics, and molecular modeling, following a new method for synthesizing the dye in high concentrations. The chromogen is shown to consist of two compounds with absorption maxima at 540-560 and 375-385 nm. The 2,6-dimethyl and 3,5-dimethyl analogues of p-aminophenol are found to undergo N- rather than C-substitution under similar conditions.
Original language | English |
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Pages (from-to) | 9901-9910 |
Number of pages | 10 |
Journal | Journal of Physical Chemistry A |
Volume | 115 |
Issue number | 35 |
DOIs | |
Publication status | Published - 8 Sep 2011 |