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Synthesis of oligoimides with terminal nadic groups in the presence of a new cyclizing system methyltriethoxysilane — tertiary aliphatic amineстатья
Дата последнего поиска статьи во внешних источниках: 10 апреля 2024 г.
- Авторы: Ustimov A.V., Tsegelskaya A.Yu, Piskarev M.S., Semenova G.K., Kuznetsov A.A.
- Журнал: Russian Chemical Bulletin
- Том: 73
- Номер: 3
- Год издания: 2024
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 674
- Последняя страница: 680
- DOI: 10.1007/s11172-024-4177-y
- Аннотация: A new method for the synthesis of reactive oligoimides with terminal nadic groupswithout the use of toxic reagents is proposed. The synthesis of ROI is carried out in dimethylacetamide(DMAA) in two stages without isolation of an intermediate product.Aromatic diamine is condensed in the fi rst stage with the mixture of aromatic dianhydrideand nadic anhydride at 25 C to form oligoamidoaci d. Thermochemical imidization ofoligoamidoacid is carried out in the second stage in the presence of a cyclizing system ofmethyltriethoxysilane and diazobicyclooctane (MTEOS—DABCO) at 140 C with theformation of oligoimides carrying terminal nadic groups. The structure of the fi nal productswas confi rmed by 1H NMR and IR spectroscopy. Bis-amidoacid 2a was obtained asan example of a model compound by condensation of 2,2-bis(4-aminophenoxyphenyl)-propane and nadic anhydride (1 : 2 mol) and the kinetics of imidization was investigated.It is demonstrated that the imidization reaction is signifi cantly accelerated in the presenceof the MTEOS + DABCO system compared to the reaction in the absence of additives.Almost complete conversion of carboxyamide groups into imide cycles is achieved in30 min, while maintaining unsaturated bonds in the terminal groups.
- Добавил в систему: Цегельская Анна Юрьевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Ekspertiza.pdf | 60,5 КБ | 18 апреля 2024 [TsegelskayaAYu] | |
| 2. | Полный текст | текст | s11172-024-4177-y.pdf | 250,9 КБ | 9 апреля 2024 [TsegelskayaAYu] |