甲苯异构体在石墨电极上的直接电氧化  

Direct Electro-oxidation of Toluene Derivations on Graphite Electrode

作　　者：朱英红[1] 陆在祥[1] 陈琼[1] 马淳安[1] 

机构地区：[1]绿色化学合成技术国家重点实验室培育基地,浙江工业大学化学工程与材料学院,杭州310032

出　　处：《高等学校化学学报》2013年第9期2210-2215,共6页Chemical Journal of Chinese Universities

基　　金：国家'九七三'计划项目(批准号:2012CB722604);浙江省重点创新团队(批准号:2009R50002)资助

摘　　要：通过循环伏安法、电化学原位红外光谱和恒电位电解法研究了甲苯异构体在0.05 mol/L硫酸体系中的直接电氧化行为.结果表明,对甲氧基甲苯、对甲基甲苯、对氯甲苯和对叔丁基甲苯4种含不同取代基的甲苯异构体具有相似的电氧化行为,均在1710 cm-1左右出现向下的羰基伸缩振动峰(υC O),在1130 cm-1左右出现向上的甲基消耗峰.通过气相色谱-质谱法(GC-MS)对恒电位电解产物进行检测,进一步证实了在石墨电极、硫酸水溶液体系中甲苯异构体直接电氧化主要产物为相应的芳香醛,40℃时,对甲氧基苯甲醛的产率为70.9%.Direct electro-oxidation p-chloro methylbenzene, p-tert-butyl behaviors of toluene derivations （p-methoxy methylbenzene, p-xylene, methylbenzene） were studied by cyclic vohammetry（CV） , in situ Fourier transform infrared spectroscopy （in situ FTIR）, and constant potential electrolysis on graphite electrode in sulfuric acid and acetone solutions. The direct electro-oxidation behaviors of the four toluene derivations were similar. The negative-going band at 1710 cm-1 is the stretching vibration peak of carboxyl group of aromatic al- dehydes, and the positive-going band at 1130 cm-~ shows the consumption peak of methyl of toluene deriva- tions. The main electro-oxidation products are aromatic aldehydes detected by gas chromatography-mass spectrometry（GC-MS）. The yield of p-methoxy benzaldehyde could reach up to 70.9% in the sulfuric acid system at40 ℃.

关 键 词：甲苯异构体 原位红外光谱 石墨电极 芳香醛 

分 类 号：O646[理学—物理化学]