p-Quinoneimine as an intermediate in the oxidative coupling of 2-amino-5-methylphenol to 4a,7-dimethyldihydro-2-aminophenoxazinone catalyzed by a monomeric copper(II) complex.
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| Title: | p-Quinoneimine as an intermediate in the oxidative coupling of 2-amino-5-methylphenol to 4a,7-dimethyldihydro-2-aminophenoxazinone catalyzed by a monomeric copper(II) complex. |
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| Authors: | Yadav, Anjana1, Mathur, Pavan1 pavanmat@yahoo.co.in |
| Source: | Catalysis Communications. Oct2014, Vol. 55, p1-5. 5p. |
| Subjects: | Imines, Intermediates (Chemistry), Oxidative coupling, Oxazinones, Copper catalysts, Complex compounds, Monomers |
| Abstract: | Copper(II) complex of a tetradentate N-picolatedbisbenzimidazolyl ligand is synthesized and characterized. XRD study reveals that copper(II) is in a distorted square plane comprising of two imine nitrogen, one oxygen atom from nitrate and another from a water molecule. This complex carries out the oxidative coupling of aminomethylphenol to phenoxazinone through an intermediate p-quinoneimine. The reaction is pseudo first order with respect to the catalyst and is self-inhibiting with increasing substrate concentration. Anion like acetate is found to increase the rate of reaction by nine times. EPR monitoring indicates the formation of a Cu(I) species which is the likely cause of inhibition of the catalytic reaction. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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