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Synthesis of a Silyl Cobalt Hydride and Its Catalytic Performance in Kumada Coupling Reactions.
- Source :
-
Chemistry - An Asian Journal . 6/1/2017, Vol. 12 Issue 11, p1234-1239. 6p. - Publication Year :
- 2017
-
Abstract
- Four silyl [P,Si]-chelate cobalt complexes ( 2- 5) have been synthesized through the chelate-assisted Si−H activation of bidentate preligand ortho-HSi(Me)2(PPh2)C6H4 ( 1) with CoMe(PMe3)4 and CoCl(PMe3)3. The silyl CoI complex, Co(PMe3)3(1-Si(Me)2-2-(PPh2)C6H4) ( 2), was synthesized by Si−H activation of 1 with CoMe(PMe3)4 or by combining complex 5 with MeLi and PMe3. Complex 2 was treated with CH3I or EtBr, generating the silyl CoII products CoI(PMe3)2(1-Si(Me)2-2-(PPh2)C6H4) ( 3) and CoBr(PMe3)2(1-Si(Me)2-2-(PPh2)C6H4) ( 4). The silyl CoIII hydride, CoHCl(PMe3)2(1-Si(Me)2-2-(PPh2)C6H4) ( 5), was obtained by the reaction of complex 1 with CoCl(PMe3)3. The catalytic performance of complex 5 was explored for Kumada coupling reactions, showing good to excellent catalytic efficiency with 2 mol % catalyst loading for the reactions of aryl chlorides or aryl bromides with Grignard reagents. It is noteworthy that the synthesis of 5 as a chelate complex is easier than that of previously reported [PSiP]-pincer cobalt hydride. With similar catalytic efficiency for Kumada reactions, the catalyst loading (2 %) of 5 was lower than that (5 %) of [PSiP]-pincer cobalt hydride. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18614728
- Volume :
- 12
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Chemistry - An Asian Journal
- Publication Type :
- Academic Journal
- Accession number :
- 123439053
- Full Text :
- https://doi.org/10.1002/asia.201700144