Catalysis of hydrosilyation.: XII. Spectrophotometric study of the reactivity of the [RhCl(COD)]2-bis(dipenylphosphinoethyl)-tetramethyldisiloxane complex with substrates of the hydrosilylation reaction |
| |
| Affiliation: | 1. Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, PR China;2. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;1. Institute of Organic Chemistry, University of Regensburg, Universitätsstr. 31, 93040 Regensburg, Germany;2. Evonik Industries AG, Paul-Baumann-Str. 1, 45772 Marl, Germany;1. Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China;2. School of Pharmacy and Department of Chemistry, University of Wisconsin, Madison, WI 53705-2222, USA;1. Department of Inorganic Chemistry, University of Pécs and János Szentágothai Science Centre, Hungary;2. MTA-PTE Research Group for Selective Chemical Syntheses, H-7624, Pécs, Hungary;3. Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary |
| |
| Abstract: | ![]()
The reactivity of the model complex - [RhCl(COD)]2 - bis(diphenylphosphineethyl)etramethyldisiloxane (I) with the substrates of the hydrosilylation (1-hexene and triethoxysilane) has been studied spectrophotometrically at room temperature. Disappearance of the band at 24.4 × 103 cm−1, characteristic for the square planar complex, I, enabled us to determine pseudo first-order rate constants (kobs) for the reaction. Relative values of kobs indicate that the reaction is four times faster with 1-hexene than with triethoxysilane. Inhibition by added siloxyphosphine (BPS-2) is evidence for preliminary replacement of phosphine by 1-hexene. Consequently, for silica-supported catalysts of the BPS ligand structure the anchored complex is released into solution during the reaction and catalyses the process homogeneously. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
