1. Pyridine N-oxide promoted hydrosilylation of carbonyl compounds catalyzed by [PSiP]-pincer iron hydrides.
- Author
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Chang, Guoliang, Zhang, Peng, Yang, Wenjing, Xie, Shangqing, Sun, Hongjian, Li, Xiaoyan, Fuhr, Olaf, and Fenske, Dieter
- Subjects
CARBONYL compounds ,PYRIDINE ,HYDROSILYLATION ,MOLECULAR structure ,HYDRIDES ,IRON compounds ,CATALYSTS - Abstract
Five [PSiP]-pincer iron hydrides 1–5, [(2-Ph
2 PC6 H4 )2 HSiFe(H)(PMe3 )2 (1), (2-Ph2 PC6 H4 )2 MeSiFe(H)(PMe3 )2 (2), (2-Ph2 PC6 H4 )2 PhSiFe(H)(PMe3 )2 (3), (2-(iPr)2 PC6 H4 )2 HSiFe(H)(PMe3 ) (4), and (2-(iPr)2 PC6 H4 )2 MeSiFe(H)(PMe3 )2 (5)], were used as catalysts to study the effects of pyridine N-oxide and the electronic properties of [PSiP]-ligands on the catalytic hydrosilylation of carbonyl compounds. It was proved for the first time that this catalytic process could be promoted with pyridine N-oxide as the initiator at 30 °C because the addition of pyridine N-oxide is beneficial for the formation of an unsaturated hydrido iron complex, which is the key intermediate in the catalytic mechanism. Complex 4 as the best catalyst shows excellent catalytic performance. Among the five complexes, complex 3 was new and the molecular structure of complex 3 was determined by single crystal X-ray diffraction. A proposed mechanism was discussed. [ABSTRACT FROM AUTHOR]- Published
- 2020
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