Rösler, Lorenz ; Höfler, Mark V. ; Breitzke, Hergen ; Wissel, Till ; Herr, Kevin ; Heise, Henrike ; Gutmann, Torsten ; Buntkowsky, Gerd (2023)
Dirhodium complex immobilization on modified cellulose for highly selective heterogeneous cyclopropanation reactions.
In: Cellulose, 2022, 29 (11)
doi: 10.26083/tuprints-00024225
Artikel, Zweitveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
A novel, efficient approach for the functionalization of microcrystalline cellulose (MCC) is presented. The as-obtained material allows the immobilization of chiral dirhodium catalysts preserving their enantioselectivity in asymmetric cyclopropanation reactions. As model, microcrystalline cellulose is modified with a polyethylene glycol derived linker, and Rh₂(S-DOSP)₄ is grafted on the material to produce a heterogeneous catalyst. SEM images at different stages of the immobilization show an unchanging uniform morphology, providing constantly good separation characteristics. The modification of the cellulose material with the polyethylene derived linker and the immobilization process are monitored using DNP enhanced ¹H → ¹³C CP MAS NMR, quantitative ¹⁹F MAS NMR, TGA and ICP-OES analysis, confirming the success of the immobilization as well as the stability of bonds between the used linker molecule and the cellulose material. Finally, the evaluation of the produced catalyst is demonstrated in the asymmetric cyclopropanation reaction between styrene and methyl(E)-2-diazo-4-phenylbut-3-enoate showing excellent enantioselectivity with an ee of nearly 90% over a wide temperature range as well as good recyclability characteristics in four consecutive catalysis cycles.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Rösler, Lorenz ; Höfler, Mark V. ; Breitzke, Hergen ; Wissel, Till ; Herr, Kevin ; Heise, Henrike ; Gutmann, Torsten ; Buntkowsky, Gerd |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Dirhodium complex immobilization on modified cellulose for highly selective heterogeneous cyclopropanation reactions |
| Sprache: | Englisch |
| Publikationsjahr: | 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2022 |
| Verlag: | Springer Nature |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Cellulose |
| Jahrgang/Volume einer Zeitschrift: | 29 |
| (Heft-)Nummer: | 11 |
| DOI: | 10.26083/tuprints-00024225 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/24225 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | A novel, efficient approach for the functionalization of microcrystalline cellulose (MCC) is presented. The as-obtained material allows the immobilization of chiral dirhodium catalysts preserving their enantioselectivity in asymmetric cyclopropanation reactions. As model, microcrystalline cellulose is modified with a polyethylene glycol derived linker, and Rh₂(S-DOSP)₄ is grafted on the material to produce a heterogeneous catalyst. SEM images at different stages of the immobilization show an unchanging uniform morphology, providing constantly good separation characteristics. The modification of the cellulose material with the polyethylene derived linker and the immobilization process are monitored using DNP enhanced ¹H → ¹³C CP MAS NMR, quantitative ¹⁹F MAS NMR, TGA and ICP-OES analysis, confirming the success of the immobilization as well as the stability of bonds between the used linker molecule and the cellulose material. Finally, the evaluation of the produced catalyst is demonstrated in the asymmetric cyclopropanation reaction between styrene and methyl(E)-2-diazo-4-phenylbut-3-enoate showing excellent enantioselectivity with an ee of nearly 90% over a wide temperature range as well as good recyclability characteristics in four consecutive catalysis cycles. |
| Freie Schlagworte: | Immobilization, Asymmetric cyclopropanation, Dirhodium, NMR spectroscopy, Dynamic nuclear polarization |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-242258 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 11 Jul 2023 11:45 |
| Letzte Änderung: | 12 Jul 2023 05:54 |
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