Determination of absolute configuration of (pi-allyl) palladium complexes by NMR spectroscopy and stereoselective complexation.
The chiral chelating ligand N,N'-bis(phenylethyl)bispidine (1) forms a rigid cavity which accommodates (pi-allyl)palladium species with high selectivity. In the resulting complex, the absolute configuration of the pi-allyl ligand can be determined by the detection in NMR spectra of a few unambiguous interligand NOEs. Dynamic processes involving the pi-allyl ligand can be investigated. Depending on the analytical target, ligand (S,S)-1 or (R,R)-1 may be used.
Uppsala University, Department of Organic Chemistry, Sweden. adolf@kemi.uu.se
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Gogoll
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Johansson
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Axén
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Grennberg