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Cyclic and oligo-carbonates by organocatalytic coupling of CO2 with epoxides or oxetanes
Alves, Margot; Grignard, Bruno; Boyaval, Amélie et al.
2016Zing Conferences, Carbon Dioxide Catalysis
 

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Keywords :
supercritical carbon dioxide
Abstract :
[en] Valorising CO2 as a renewable C1 feedstock for producing added value building blocks is the scope of many academic and industrial researches. Carbon dioxide is a thermodynamically and kinetically stable molecule that can be converted into five and six membered cyclic carbonates by coupling with epoxides or oxetanes, respectively, using appropriate catalysts. Although transition metal catalysts are efficient under atmospheric pressure and ambient temperature, most of them are poorly selective, sensitive to hydrolysis and/or oxidation and/or toxic whereas less/non-toxic and eco-friendly organocatalysts such as ionic liquids and halide salts are generally only efficient at very high temperature and pressure favouring their thermal degradation. To overcome these limitations, we developed a new highly efficient bicomponent homogeneous organocatalyst composed of an ammonium salt as the catalyst and fluorinated single or double hydrogen bond donor activators. Through online FTIR kinetic studies, we demonstrated that this new organocatalyst showed unexpected catalytic activity for the fast and selective addition of CO2 onto epoxides under solvent-free and mild experimental conditions. The use of this dual catalyst was then extended to the coupling of CO2 with less reactive oxetanes to produce hydroxyl telechelic oligocarbonates. In the first part of this talk, based on kinetics of reactions followed by online FTIR under pressure, we will describe the reaction conditions required for the organocatalytic coupling of CO2 with epoxides and oxetanes. In the second part, the mechanism of the reaction will be approached and discussed based on DFT calculations. Finally, we will compare and discuss the efficiency of various organocatalytic systems for this type of reaction.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Alves, Margot ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Grignard, Bruno ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Boyaval, Amélie ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Gennen, Sandro ;  Université de Liège > Département de chimie (sciences) > Centre d'études et de rech. sur les macromolécules (CERM)
Méreau, Raphaël;  University of Bordeaux, Institute of Molecular Sciences, France
Tassaing, Thierry;  University of Bordeaux, Institute of Molecular Sciences, France
Detrembleur, Christophe ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Dewinter, Julien;  University of Mons-Hainaut (UMH), Mass Spectrometry Research Group, Interdisciplinary Center of Mass Spectrometry (CISMa)
Gerbaux, Pascal;  University of Mons-Hainaut (UMH), Mass Spectrometry Research Group, Interdisciplinary Center of Mass Spectrometry (CISMa)
Jérôme, Christine  ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Cyclic and oligo-carbonates by organocatalytic coupling of CO2 with epoxides or oxetanes
Publication date :
20 April 2016
Event name :
Zing Conferences, Carbon Dioxide Catalysis
Event place :
Albufeira, Portugal
Event date :
19/04/2016 - 22/04/2016
Audience :
International
Funders :
The International Doctoral School IDS-Funmat
University of Bordeaux [FR]
Funding text :
University of Bordeaux through the IDEX
Available on ORBi :
since 25 April 2016

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