کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
49486 | 46750 | 2014 | 5 صفحه PDF | دانلود رایگان |
• Bis-benzimidazol ligand and its copper(II) complex
• Oxidation of 2-amino-5-methylphenol
• p-Quinoneimine intermediate formation
• The reaction is self- inhibiting with increasing substrate concentration.
• 4a,7-Dimethyldihydro-2-aminophenoxazinone is found as the final product.
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.
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Journal: Catalysis Communications - Volume 55, 5 October 2014, Pages 1–5