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Crown ether styryl dyes .18. Synthesis, anion-''capped'' complexes, and ion-selective stereospecific [2+2] autophotocycloaddition of photochromic 18-crown-6 ethersстатья
Информация о цитировании статьи получена из
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Gromov S.P., Ushakov E.N., Fedorova O.A., Buevich A.V., Alfimov M.V.
- Журнал: Russian Chemical Bulletin
- Том: 45
- Номер: 3
- Год издания: 1996
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 654
- Последняя страница: 661
- DOI: 10.1007/BF01435800
- Аннотация: New crown ether styryl dyes (trans-1c,d) containing the 18-crown-6 ether fragment were synthesized. interaction of trans-1c,d dyes, as well as their analogs, trans-1a,b containing the 15-crown-5 ether fragment, with Ca(ClO4)(2) in MeCN afforded supramolecular structures (dimeric complexes). Competing reactions, trans-cis-photoisomerization with the formation of anion-''capped'' complexes of cis-1a-d and [2+2] autophotocycloaddition with the formation of cyclobutane derivatives 8a-d and Be, were observed on photolysis of solutions Elf complexes of trans-1a-d with Ca2+. Preorganization of trans-isomers in dimeric complexes with Ca2+ determined the regio- and stereoselectivity of each of the two directions of the photocycloaddition and the efficiency of the reaction.
- Добавил в систему: Громов Сергей Пантелеймонович