Synthesis and Characterization of Novel Aminophosphine Ligands Based on Ferrocenodecaline Backbones |
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| Authors: | Max Weißenbacher Thomas Sturm Hermann Kalchhauser Christoph Kratky Walter Weissensteiner |
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| Institution: | Institut für Organische Chemie, Universit?t Wien, A-1090 Wien, Austria, AT
Institut für Chemie, Universit?t Graz, A-8010 Graz, Austria, AT
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| Abstract: | Summary. Novel aminophosphine ligands for enantioselective transition metal catalysts based on different ferroceno cis- and trans-decaline backbones were synthesized and structurally characterized. Their palladium dichloride complexes were tested in the
asymmetric Grignard cross coupling reaction of vinyl bromide and phenylethyl magnesium chloride, but only very low enantioselectivities were
obtained. Steric strain in the aminophosphine ligands causes a severe backbone deformation and in addition leads to a slowed
rotation of the respective dimethylamino group as was detected by variable temperature NMR spectroscopy.
Received January 4, 2002. Accepted January 16, 2002 |
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| Keywords: | , ,Aminophosphines, Asymmetric catalysis, Ferrocene, Grignard cross coupling, Variable temperature NMR, X-Ray diffraction, |
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