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2-Cyclopropylbenzoic acids in the synthesis of phthalides and 3,4-dihydroisocoumarins статья
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
- Авторы: Mochalov S.S., Fedotov A.N., Kutateladze T.G., Trofimova E.V., Shabarov Yu S., Zefirov N.S.
- Журнал: Chemistry of Heterocyclic Compounds
- Том: 34
- Номер: 3
- Год издания: 1998
- Издательство: Kluwer Academic/Plenum Publishers
- Местоположение издательства: United States
- Первая страница: 288
- Последняя страница: 293
- Аннотация: 2-Cyclopropylbenzoic acids, under the action of strong protic acids (FSO 3H, H 2SO 4), are convened to 3-ethylphthalidium ions. In solutions in these inorganic acids, the 3-ethylphthalidium ions are isomerized to 3-methyl-3,4-dihydroisocoumarinium ions. As a result, a thermodynamic equilibrium is established, with the concentrations of both types of cyclic ions depending on the nature of the substituent in the aromatic part of the substrate. Neutralization of the original solutions of 3-ethylphthalidium ions or a mixture of these with 3-methyl-3,4-dihydroisocoumarinium ions, gave either 3-ethylphthalides or their mixtures with 3-methyl-3,4-dihydroisocoumarins. The neutral 3-ethylphthalides and 3-methyl-3,4-dihydroisocoumarins, when subjected to the action of inorganic acids, are also isomerized to form in each case a mixture of ions with concentrations matching the concentrations of ions formed from the corresponding 2-cyclopropylbenzoic acids. ©1998 Plenum Publishing Corporation.
- Добавил в систему: Федотов Александр Николаевич