| Autor: |
Pawar GM; Leibniz-Institut für Oberflächenmodifizierung e.V., Permoserstrasse 15, D-04318 Leipzig, Germany., Bantu B, Weckesser J, Blechert S, Wurst K, Buchmeiser MR |
| Jazyk: |
angličtina |
| Zdroj: |
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2009 Nov 07 (41), pp. 9043-51. Date of Electronic Publication: 2009 Jul 31. |
| DOI: |
10.1039/b909180g |
| Abstrakt: |
Ring-opening metathesis polymerization has been used for the synthesis of the amphiphilic block-copolymer poly(M1-co-M3)-b-poly(M2) from the hydrophilic monomer 5-{2-[2-(2-methoxy-ethoxy)-ethoxy]-ethoxymethyl}-7-oxabicyclo[2.2.1]hept-2-ene (M2), and the hydrophobic monomers endo,exo-5-decyloxymethyl-bicyclo[2.2.1]hept-2-ene (M1) and 1,3-di(1-mesityl)-4-{[(bicyclo[2.2.1]hept-5-en-2-ylcarbonyl)oxy]methyl}-4,5-dihydro-1H-imidazol-3-ium carboxylate (M3). Poly(M1-co-M3)-b-poly(M2) was loaded with Cu and the resulting Cu(I)-loaded polymer poly(M1-co-M3)-b-poly(M2)-Cu was used for a series of Cu-catalyzed reactions under micellar conditions, i.e. for the [3 + 2] cycloaddition of azides to alkynes and for carbonyl hydrosilylation reactions. Under such micellar conditions, the polymer-bound Cu-catalyst was found to be an efficient catalyst for all reactions investigated. Turn-over numbers (TONs) in cycloaddition reactions were in the range of 200-375, those in hydrosilylation reactions approximately 2000 allowing for Cu-loadings of 0.05 mol% with respect to substrate. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
