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研究了7种取代查耳酮肟的电化学行为.用氢氧化钠底液热解石墨工作电极,取代查耳酮肟的电极过程为le氧化不可逆吸附电极过程.它们的氧化电位随取代基吸电子能力的增强而增高,并与它们相应的Hammett常数呈线性关系.取代查耳酮肟后的电化学氧化机理为先失去一个电子生成iminoxy自由基,然后由自由基对分子内烯键进行环化加成,脱氢后形成3.5-二取代异(口恶)唑.用控制电位电解和紫外吸收光谱检测了部份电化学氧化产物,证明取代查耳酮肟后电化学氧化产物和化学氧化产物是一致的,因此,电化学氧化是一种不用化学氧化剂的使取代查耳酮肟生成3.5-二取代异(口恶)唑的方法.
The electrochemical behavior of seven substituted chalcone oximes was studied. The electrode of pyrolytic graphite electrode was replaced by sodium hydroxide at the bottom of the electrode, and the electrode was replaced by leucosylated irreversible electrode. The oxidation potentials of these electrodes varied with the substituent Electron capacity increased and increased, and with their corresponding Hammett constant linear relationship.After replacing the chalcone oxime electrochemical oxidation mechanism is the first to lose an electron to generate iminoxy free radicals, and then the free radical intramolecular ene ring ring After the addition and dehydrogenation, 3.5-disubstituted oxazoles were formed.The electrochemical oxidation products were detected by potentiodynamic electrolysis and ultraviolet absorption spectroscopy, and it was proved that the electrochemical oxidation products and chemical oxidation were replaced by the substituted chalcone oxime The product is consistent, therefore, electrochemical oxidation is a chemical oxidant-free replacement of chalcone oximes to 3.5-disubstituted oxazoles.