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Influence of Substituents in a Six-Membered Chelate Ring of HG-Type Complexes Containing an N-Ru Bond on Their Stability and Catalytic Activityстатья
- Авторы: Vasilyev Kirill A., Antonova Alexandra S., Volchkov Nikita S., Logvinenko Nikita A., Nikitina Eugeniya V., Grigoriev Mikhail S., Novikov Anton P., Kouznetsov Vladimir V., Polyanskii Kirill B., Zubkov Fedor I.
- Журнал: Molecules
- Том: 28
- Номер: 3
- Год издания: 2023
- Издательство: MDPI
- Местоположение издательства: Basel, Switzerland
- Номер статьи: 1188
- DOI: 10.3390/molecules28031188
- Аннотация: An efficient approach to the synthesis of olefin metathesis HG-type catalysts containing an N→Ru bond in a six-membered chelate ring was proposed. For the most part, these ruthenium chelates can be prepared easily and in high yields based on the interaction between 2-vinylbenzylamines and Ind II (the common precursor for Ru-complex synthesis). It was demonstrated that the increase of the steric volume of substituents attached to the nitrogen atom and in the α-position of the benzylidene fragment leads to a dramatic decrease in the stability of the target ruthenium complexes. The bulkiest iPr substituent bonded to the nitrogen atom or to the α-position does not allow the closing of the chelate cycle. N,N-Diethyl-1-(2-vinylphenyl)propan-1-amine is a limiting case; its interaction with Ind II makes it possible to isolate the corresponding ruthenium chelate in a low yield (5%). Catalytic activity of the synthesized complexes was tested in RCM reactions and compared with α-unsubstituted catalysts obtained previously. The structural peculiarities of the final ruthenium complexes were thoroughly investigated using XRD and NMR analysis, which allowed making a reliable correlation between the structure of the complexes and their catalytic properties.
- Добавил в систему: Новиков Антон Петрович