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Electrochemical reduction of bromine- and iodine-substituted salts of N-methylpyridiniumстатья
Информация о цитировании статьи получена из
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Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Nekrasov L.N., Almualla Kh, Khomchenko T.N., Karchava A.V., Bundel’ Yu G.
- Журнал: Russian Journal of Electrochemistry
- Том: 33
- Номер: 4
- Год издания: 1997
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 349
- Последняя страница: 353
- Аннотация: The cathodic reduction of iodides of 1-methyl-3-bromo- and 1-methyl-2-iodopyridinium is examined. It is shown that, at the introduction of a bromine atom into a heteroaromatic cycle, the reaction mechanism remains the same as for the electroreduction of unsubstituted salts of alkylpyridinium in alkaline solutions; however, the reactivities of the initial and end compounds undergo a change, as well as the solubility of the latter. Comparing the effect of the methyl group in different positions in the cycle and that of bromine atom in position 3 on properties of the initial cations and the dimeric reaction products confirms indirectly the proposed structure of the dimers as the charge-transfer complexes that are formed during electrolysis of alkylpyridinium salt solutions in polar media. The pyridinium salt that contains an iodine atom in position 2 undergoes a chemical transformation in an aqueous medium and does not reduce on the electrode. In acetonitrile solutions, its cations are stable, and the process involves two successive stages characterized by two waves in the polarization curve. In the potential region of the first wave, iodine splits out; in the region of the second wave, the formed methylpyridinium cations unsubstituted in the ring are reduced. © 1997 MAEe cyrillic signK Hayκa/Interperiodica Publishing.
- Добавил в систему: Карчава Александр Вахтангович