Guo Xiu-chun
2006
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Journal
Journal of Qingdao University of Science and Technology
Abstract
2,3-Dimethoxy-5-methyl-1,4-benzoquinone was synthesized by indirect electro-oxidation.Electron carrier Ce~(4+)/Ce~(3+) was used as oxidation medium.In electrolysis tank of septum,Ce(Ⅲ) was oxidized to Ce(Ⅳ) by which 2,3,4,5-tetramethoxytoluene was oxidized to 2,3-dimethoxy-5methyl-1,4-benzoquinone,while Ce(Ⅳ) was reduced to Ce(Ⅲ).The influences of some reaction factors on yields of Ce(Ⅳ) and the chemical oxidation were studied.The optimum electrolytic conditions were nitric acid concentration 0.5 mol·L~(-1),current density 500 A·m~(-2).The optimum oxidation conditions were room temperature,concentration of Ce(Ⅳ) 0.8~1.2 mol·L~(-1).Compared with common methods used in industry,this synthetic method has high purity of product,little consumption of materials and no environmental pollution.