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作 者:杨丰科[1] 陈芳[1] 王全国[1] 郭秀春[1]
出 处:《青岛科技大学学报(自然科学版)》2006年第3期189-192,共4页Journal of Qingdao University of Science and Technology:Natural Science Edition
摘 要:采用间接电氧化法合成了2,3-二甲氧基-5-甲基-1,4-苯醌。以具有氧化还原活性的电子载体Ce^4+/Ce^3+作为氧化媒质,在电解槽中将Ce(Ⅲ)氧化为Ce(Ⅳ),然后用Ce(Ⅳ)氧化2,3,4,5-四甲氧基甲苯,本身被还原为Ce(Ⅲ)后,再返回电解槽进行氧化再生。研究了诸多因素对Ce(Ⅳ)产率和化学氧化反应收率的影响。得到最佳电解条件:硝酸浓度0.5mol·L^-1,电流密度500A·m^-2。最佳氧化条件:Ce(Ⅳ)浓度0.8~1.2mol·L^-1,室温。该合成方法与工业常用方法相比,产品的纯度高,原材料的消耗少,不存在对环境的污染。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-5-methyl-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 tool ·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.
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