Electrostatically immobilised BOX and PYBOX metal catalysts: application to ene reactions |
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Authors: | Chiara McDonagh |
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Institution: | National University of Ireland, Galway, School of Chemistry, SMA?T (Synthetic Methods: Asymmetric Catalytic Transformations), Ireland |
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Abstract: | Copper(I), copper(II) and scandium(III) triflate complexes of BOX and PYBOX ligands have been electrostatically immobilised on silica. The performance of the immobilised catalysts, in the two carbonyl-ene reactions studied, compares very well with that of their homogeneous equivalents. The immobilised catalysts were successfully reused a number of times. In the case of a scandium complex, a variation in enantioselectivity of up to 73% was observed on immobilisation compared to its use homogeneously. The reason for this variation in enantioselectivity is explored with the aid of molecular modelling. |
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Keywords: | Copper Scandium(III) Bis(oxazolinyl)pyridine Bis(oxazoline) Electrostatic immobilisation Ene reaction Silica Molecular modelling |
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