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Metal-ligand cooperation in the catalytic oxidation of (R)-carvone by Ga (NO3)3/H2O2 57статья
- Авторы: Correi Gilvan A., de Araújo Marcos L., Carvalho Wagner A., Sairre Mirela, Cerchiaro Giselle, Shul’pina Lidia S., Kozlov Yuriy N., Shul´pin Georgiy B., Kirillov Alexander M., Mandelli Dalmo
- Журнал: MOLECULAR CATALYSIS
- Том: 528
- Год издания: 2022
- Номер статьи: 112457
- DOI: 10.1016/j.mcat.2022.112457
- Аннотация: In this work, the catalytic epoxidation of (R)-carvone by the Ga(NO3)3/H2O2 system was studied alongside themetal-ligand cooperation by exploring 17 different ligands. It was observed that the acidic ligands such as aceticacid mostly favor the epoxidation of the endocyclic double bond of (R)-carvone (22% yield, 1 h), while nitrogenheterocycles direct the epoxidation to the exocyclic double bond, especially the ones that are unsubstituted orhave electron-donating groups, such as pyrazine (28% yield, 5 h), 4-dimethylaminopyridine (28% yield, 8 h),and 1-methyimidazole (43% yield, 8 h). Pyrazinecaboxylic acid favored the epoxidation of the exocyclic doublebond (25%, 3 h). EPR analysis of both Ga(NO3)3/H2O2 and Ga(NO3)3/PCA/H2O2 systems indicates the presenceof hydroxyl radicals in the reaction medium, although these do not determine the epoxidation rate that is likelyregulated by the interaction of Ga-peroxo complexes with (R)-carvone. This study contributes to widening theapplication of the cooperating ligand concept in molecular catalysis toward further development of more selectiveand efficient epoxidation reactions catalyzed by non-transition metal centers.
- Добавил в систему: Шульпина Лидия Сергеевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | экспертное заключение | expert-2022-Dalmo.pdf | 883,8 КБ | 27 июля 2022 [ShulpinaLS.] | |
| 2. | Полный текст | Mol.Catal._-2022-Dalmo-Ga.pdf | 3,0 МБ | 22 июля 2022 [ShulpinaLS.] |