The reaction between epoxides and CO2 to yield cyclic carbonates is efficiently promoted under solvent-free and mild reaction conditions (0.5 mol% catalyst loading, 0.8 MPa, 125 °C) by zinc(II) complexes of pyridine containing macrocyclic ligands (Pc-L pyridinophanes). The zinc complexes have been fully characterised, including X-ray structural determination. The [Zn(II)X(Pc-L)]X complexes showed good solubility in several polar solvents, including cyclic carbonates. The scope of the reaction under solvent-free conditions has been studied and good to quantitative conversions with excellent selectivities have been obtained starting from terminal epoxides. When solvent-free conditions were not possible (solid epoxides or low solubility of the catalyst in the oxirane) the use of cyclic carbonates as solvents has been investigated with success. The remarkable stability of the catalytic system has been demonstrated by a series of consecutive runs.

[Zinc(II)(Pyridine‐Containing Ligand)] Complexes as Single‐Component Efficient Catalyst for Chemical Fixation of CO2 with Epoxides / M. Cavalleri, N. Panza, A. di Biase, G. Tseberlidis, S. Rizzato, G. Abbiati, A. Caselli. - In: EUROPEAN JOURNAL OF ORGANIC CHEMISTRY. - ISSN 1434-193X. - 2021:19(2021 May 20), pp. 2764-2771. [10.1002/ejoc.202100409]

[Zinc(II)(Pyridine‐Containing Ligand)] Complexes as Single‐Component Efficient Catalyst for Chemical Fixation of CO2 with Epoxides

M. Cavalleri
Primo
;
N. Panza
Secondo
;
A. di Biase;G. Tseberlidis;S. Rizzato;G. Abbiati
Penultimo
;
A. Caselli
Ultimo
2021-05-20

Abstract

The reaction between epoxides and CO2 to yield cyclic carbonates is efficiently promoted under solvent-free and mild reaction conditions (0.5 mol% catalyst loading, 0.8 MPa, 125 °C) by zinc(II) complexes of pyridine containing macrocyclic ligands (Pc-L pyridinophanes). The zinc complexes have been fully characterised, including X-ray structural determination. The [Zn(II)X(Pc-L)]X complexes showed good solubility in several polar solvents, including cyclic carbonates. The scope of the reaction under solvent-free conditions has been studied and good to quantitative conversions with excellent selectivities have been obtained starting from terminal epoxides. When solvent-free conditions were not possible (solid epoxides or low solubility of the catalyst in the oxirane) the use of cyclic carbonates as solvents has been investigated with success. The remarkable stability of the catalytic system has been demonstrated by a series of consecutive runs.
carbon dioxide fixation; zinc complexes; cycloaddition; cyclic carbonates; pyridine containing macrocyclic ligands;
Settore CHIM/03 - Chimica Generale e Inorganica
22-apr-2021
https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/ejoc.202100409
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/839728
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