Abstract
New neutral and zwitterionic chiral NNO-donor scorpionate ligands 1 and 2 were designed to obtain new mononuclear and dinuclear NNO-heteroscorpionate aluminum complexes. Reaction of 1 with [AlR3] (R=Me, Et) in a 1:1 or 1:2 molar ratio afforded the neutral mononuclear alkyl complexes [AlR2(κ2-bpzappe)] (R=Me (3), Et (4); bpzappeH=2,2-bis(3,5-dimethylpyrazol-1-yl)-1-[4-(dimethylamino)phenyl]-1-phenylethanol) and bimetallic complexes [(AlR2(κ2-bpzappe))(μ-O)(AlR3)] [R=Me (5), Et (6)]. By reaction of complexes 3-6 with PhCH2Br, mononuclear and dinuclear cationic aluminum complexes [AlR2(κ2-bbpzappe)]Br (R=Me (7), Et (8); bbpzappeH=N-benzyl-4-[2,2-bis(3,5-dimethyl-1H-pyrazol-1-yl)-1-hydroxy-1-phenylethyl]-N,N-dimethylbenzenaminium bromide) and [(AlR2(κ2-bbpzappe))(μ-O)(AlR3)]Br [R=Me (9), Et (10)] were synthesized. Both neutral aluminum complexes in the presence of Bu4NBr and cationic aluminum complexes were investigated as catalysts for cyclic carbonate formation from epoxides and carbon dioxide. Amongst them, complex10 was found to be an efficient one-component catalyst for the synthesis of cyclic carbonates from both monosubstituted and internal epoxides and was shown to have broad substrate scope.
Original language | English |
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Journal | ChemSusChem |
Early online date | 27 Dec 2016 |
DOIs | |
Publication status | E-pub ahead of print - 27 Dec 2016 |
Bibliographical note
© 2016, Wiley. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for detailsKeywords
- Aluminum
- Carbon dioxide fixation
- Cyclic carbonates
- Epoxides
- Sustainable chemistry