کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1324885 | 977358 | 2011 | 6 صفحه PDF | دانلود رایگان |
Hydrosilylation reactions of styrene with triethoxysilane catalyzed by rhodium complexes with phosphine ligands functionalized with imidazolium salts are reported. In comparison with Wilkinson’s catalyst, Rh(PPh3)3Cl, all of the present rhodium complexes with phosphines functionalized with imidazolium salts exhibit higher catalytic activity and selectivity.
Hydrosilylation reactions of styrene with triethoxysilane catalyzed by rhodium complexes with phosphine ligands functionalized with imidazolium salts are reported. In comparison with Wilkinson’s catalyst, Rh(PPh3)3Cl, all of the present rhodium complexes with phosphines functionalized with imidazolium salts exhibit higher catalytic activity and selectivity.Figure optionsDownload as PowerPoint slideResearch highlights
► Rh(PPh3)3Cl, all of the present rhodium complexes with phosphines functionalized with imidazolium salts exhibit higher catalytic activity and selectivity.
► Our synthetic method is based on the quaternization of N-alkylimidazoles with Br(CH2)nCl (n=2 or 3) to give1-(n-chloroalkyl)-3-alkyl-imidazolium salts, followed by nucleophilic substitution with LiPPh2 to produce the desired ligands.
► Phosphines bearing imidazolium moieties may function as ambivalent P, C-donor systems, with the electron-rich imidazolium moiety providing a suitable modification that stabilizes the Rh-phosphine, which may be due to formation of Rh-NHC complex during the catalytic process.
► The RhCl3-4c/BMimPF6 catalyst system could be reused without noticeable loss of catalytic activity or selectivity.
Journal: Journal of Organometallic Chemistry - Volume 696, Issue 1, 1 January 2011, Pages 263–268