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- W1970513577 abstract "1,3-Bis(3-butylimidazolium-1-yl)benzene diiodide (1) was reacted with Li(2,2,6,6-tetramethylpiperidine) yielding the free bis-carbene, 1,3-bis(3-butylimidazol-2-ylidene-1-yl)benzene (3), which has been spectroscopically characterized. Combining the free bis-carbene with [Rh(COD)Cl]2 yielded the corresponding di-Rh bis(N-heterocyclic carbene) complex (4) that was structurally characterized. The di-Rh bis-carbene complex was found to exhibit complex solution 13C and 1H NMR spectra that have been assigned as a mixture of diastereomers. The crystal structure of the di-Rh bis-carbene compound 4 was composed of a pair of enantiomeric atropisomers. The diastereomeric atropisomers were assigned as the source of the spectral complexities. The di-Rh di-carbene complex 4 and the CCC–NHC Rh pincer complex 2 were applied as catalysts in hydrosilylation reactions of terminal and internal alkynes. Both catalysts are highly active, regioselective, stereoselective, and chemoselective: terminal alkynes give predominantly the β-(Z) isomer and internal alkynes afford the β-(E) isomer in chloroform or benzene. One of the strongest attributes of the catalyst systems is that the results were achieved without exclusion of air and without purification of commercially available reagents." @default.
- W1970513577 created "2016-06-24" @default.
- W1970513577 creator A5010188914 @default.
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- W1970513577 creator A5052549530 @default.
- W1970513577 creator A5066583306 @default.
- W1970513577 creator A5081066698 @default.
- W1970513577 date "2005-12-01" @default.
- W1970513577 modified "2023-10-14" @default.
- W1970513577 title "Synthesis and characterization of a free phenylene bis(N-heterocyclic carbene) and its di-Rh complex: Catalytic activity of the di-Rh and CCC–NHC Rh pincer complexes in intermolecular hydrosilylation of alkynes" @default.
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- W1970513577 doi "https://doi.org/10.1016/j.jorganchem.2005.07.088" @default.
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