| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 66021 | Journal of Molecular Catalysis A: Chemical | 2012 | 5 Pages |
5,10,15,20-Tetrakis-(p-sulfonatophenyl)porphinatocobalt(II) and 5,10,15,20-tetrakis-(p-sulfonatophenyl)porphinatomanganese(III) chloride have been used as catalysts for the oxidative coupling of 2-aminophenol to 2-aminophenoxazine-3-one with molecular oxygen and hydrogen peroxide. The effects of pH and concentration of catalysts, hydrogen peroxide and oxygen on the oxidation reaction and yield of 2-aminophenoxazine-3-one have been studied. The oxidation of 2-aminophenol with molecular oxygen catalyzed by cobalt(II) tetra(4-sulfophenyl)porphyrin involves a hydrogen atom abstraction from 2-aminophenol by cobalt(II) superoxo species. UV–vis analysis indicated that oxomanganese(IV) is the active species in the oxidation of 2-aminophenol with hydrogen peroxide and manganese(III)tetra(4-sulfophenyl)porphyrin.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (71 K)Download as PowerPoint slideHighlights► Cobalt(II) tetra(p-sulfophenyl)porphyrin is an efficient catalyst for oxidation of 2-aminophenol with molecular oxygen. ► 2-Aminophenoxazine-3-one was obtained in high yield. ► Manganese(III)tetra(p-sulfophenyl)porphyrin promoted oxidation of OAP with H2O2. ► UV–vis analysis indicated that oxomanganese(IV) is the active species in the oxidation with H2O2 and manganese(III) porphyrin.
