Synthesis of helical aluminium catalysts for cyclic carbonate formation

Helical aluminium complexes [Al 2 X 4 (μ-nbptam)] (X = Me 1 , Et 2 ), [Al 2 X 4 (μ-fbpam)] (R = Me 3 , Et 4 ), [Al 3 X 7 (μ-nbptam)] (X = Me 5 , Et 6 ) and [Al 3 X 7 (μ-fbpam)] (X = Me 7 , Et 8 ) have been prepared by treatment of scorpionate ligand precursors with two or three equivalents of the co...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2019-03, Vol.48 (13), p.4218-4227
Main Authors: Gaona, Miguel A, de la Cruz-Martínez, Felipe, Fernández-Baeza, Juan, Sánchez-Barba, Luis F, Alonso-Moreno, Carlos, Rodríguez, Ana M, Rodríguez-Diéguez, Antonio, Castro-Osma, José A, Otero, Antonio, Lara-Sánchez, Agustín
Format: Article
Language:English
Subjects:
Aluminum
Carbon dioxide
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Crystal structure
Crystallography
Cyclohexene
Organic chemistry
Polyether carbonate
Substrates
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Summary:Helical aluminium complexes [Al 2 X 4 (μ-nbptam)] (X = Me 1 , Et 2 ), [Al 2 X 4 (μ-fbpam)] (R = Me 3 , Et 4 ), [Al 3 X 7 (μ-nbptam)] (X = Me 5 , Et 6 ) and [Al 3 X 7 (μ-fbpam)] (X = Me 7 , Et 8 ) have been prepared by treatment of scorpionate ligand precursors with two or three equivalents of the corresponding trialkylaluminium derivative. The structures of these complexes have been determined by spectroscopic methods and the X-ray crystal structure of complex 1 has also been established. These complexes have been studied as catalysts for the chemical fixation of carbon dioxide into cyclic carbonates displaying good catalytic activity. When cyclohexene oxide was used as a substrate, polyether-polycarbonate was obtained in a ratio which is highly dependent on the cocatalyst and the catalyst to cocatalyst ratio used. Helical aluminium complexes have been prepared and used as catalysts for cyclic carbonate synthesis.
ISSN:1477-9226
1477-9234
DOI:10.1039/c9dt00323a