质子化
化学
循环伏安法
极谱法
无机化学
亚胺
吸附
伏安法
水溶液
胺气处理
药物化学
电化学
催化作用
电极
物理化学
有机化学
离子
作者
Milivoje Aleksic,Vera Kapetanović,P. Zuman
出处
期刊:ChemPlusChem
[Institute of Organic Chemistry & Biochemistry, Academy of Sciences of the Czech Republic]
日期:2004-01-01
卷期号:69 (7): 1429-1442
被引量:8
摘要
Evaluation of DC polarographic i - E curves and analogous curves obtained by cyclic voltammetry in aqueous buffers as well as in buffers containing 30% v/v ethanol indicated that the methoxyimino group of cefetamet is reduced on DME and HDME in the following way: the methoxyimino group can be at the electrode surface rapidly protonated up to pH about 9. In the protonated form of the grouping (>C=NH-OCH 3 ) + , the OCH 3 is cleaved off in the first two-electron step. The resulting imine is in equilibrium with its protonated form, which is reduced in a second two-electron step. At pH higher than about 10, the unprotonated form of the methoxyimino group is reduced in a single four-electron step to amine. Studies using cyclic voltammetry were complicated by adsorption phenomena.
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