Role of MnIV Species in Mn(salen) Catalyzed Enantioselective Aerobic Epoxidations of Alkenes: An EPR Study Научная публикация
| Журнал |
Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169 |
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| Вых. Данные | Год: 2002, Том: 178, Номер: 1-2, Страницы: 47-53 Страниц : 7 DOI: 10.1016/S1381-1169(01)00296-5 | ||
| Ключевые слова | Chiral schiff bases, Enantioselective, Epoxidations, EPR, Mixed-valence dimers, Mn(salen) complexes | ||
| Авторы |
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| Организации |
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Информация о финансировании (2)
| 1 | Российский фонд фундаментальных исследований | 00-03-32438 |
| 2 | Российский фонд фундаментальных исследований | 99-03-32448 |
Реферат:
Using EPR spectroscopy, high valence Mn(salen) complexes were monitored in MnIII(salen)/isobutyraldehyde/O2 and MnIII(salen)/pivalaldehyde/O2 catalytic systems in the absence and in the presence of N-methylimidazole (N-Me-Imd), where MnIII(salen) (1) is (S,S)-(+)-N,N′-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamino-manganese(III) chloride. Interaction of 1 with aliphatic aldehydes in the presence of O2 was found to give a mixture of oxo manganese(IV) species L1(salen)MnIV=O (2) with various axial ligands L1 (L1=Cl−, RCOO−). They display EPR signals having close g values of ca. 5.2 with resolved hyperfine structures from one manganese (A=75 G, Full-size image (<1 K), I=5/2). In the presence of N-Me-Imd, new manganese(IV) complexes were detected. The first one was shown to be an antiferromagnetically coupled mixed-valence [(salen)MnIV(μ2-O)2MnIII(salen)]− dimer having 16-line EPR signal at g=2. The second one is probably (salen)MnIV(OOCOR)N-Me-Imd acylperoxo complex (2) (g=4.2 (R=CH(CH3)2), or g=4.7 (R=C(CH3)3), unresolved manganese hyperfine structure). Possible roles of each complex in the enantioselective alkene epoxidations are discussed.
Библиографическая ссылка:
Bryliakov K.P.
, Kholdeeva O.A.
, Vanina M.P.
, Talsi E.P.
Role of MnIV Species in Mn(salen) Catalyzed Enantioselective Aerobic Epoxidations of Alkenes: An EPR Study
Journal of Molecular Catalysis A: Chemical. 2002. V.178. N1-2. P.47-53. DOI: 10.1016/S1381-1169(01)00296-5 WOS Scopus РИНЦ CAPlusCA OpenAlex
Role of MnIV Species in Mn(salen) Catalyzed Enantioselective Aerobic Epoxidations of Alkenes: An EPR Study
Journal of Molecular Catalysis A: Chemical. 2002. V.178. N1-2. P.47-53. DOI: 10.1016/S1381-1169(01)00296-5 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 10 янв. 2001 г. |
| Принята к публикации: | 25 июн. 2001 г. |
| Опубликована online: | 28 дек. 2001 г. |
| Опубликована в печати: | 23 янв. 2002 г. |
Идентификаторы БД:
| Web of science: | WOS:000173274500007 |
| Scopus: | 2-s2.0-0037160313 |
| РИНЦ: | 13405725 |
| Chemical Abstracts: | 2002:6187 |
| Chemical Abstracts (print): | 136:294429 |
| OpenAlex: | W2078367553 |