Aluminium salabza complexes for fixation of CO2 to organic carbonates

A highly stable and easy to synthesize aluminium complex bearing a flexible N2O2-donor salabza ligand (N,N'-bis(salicylene)-2-aminobenzylamine) in combination with tetrabutylammonium bromide forms an active binary catalytic system for the cycloaddition of CO2 to epoxides (TOFs 120-3434 h(-1)) u...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2016-10, Vol.45 (37), p.14658-14667
Main Authors: Cuesta-Aluja, L, Castilla, J, Masdeu-Bultó, A M
Format: Article
Language:English
Subjects:
Aluminum
Binary systems (materials)
Carbon dioxide
Catalysts
Cycloaddition
Ligands
Oxides
Tetrabutylammonium bromide
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Summary:A highly stable and easy to synthesize aluminium complex bearing a flexible N2O2-donor salabza ligand (N,N'-bis(salicylene)-2-aminobenzylamine) in combination with tetrabutylammonium bromide forms an active binary catalytic system for the cycloaddition of CO2 to epoxides (TOFs 120-3434 h(-1)) under mild conditions (10 bar, 80 °C) and low catalyst loadings (0.05-0.2 mol%). Kinetic experiments have shown that the cycloaddition of CO2 to styrene oxide catalyzed by 1/TBAB is first order in 1, TBAB, CO2 and epoxide. A reaction mechanism is proposed based on these observations. Fe(iii) and Co(iii) related complexes are less active catalysts for this reaction.
ISSN:1477-9226
1477-9234
DOI:10.1039/c6dt01069e