Abstract
(Cyclohexylmethylphenylphosphine)[(1-η1:6−8-η3)-octa-2,6-diene-1,8-diyl]palladium(II) (1) was synthesized from bis(η3-propenyl)palladium(II) and 1,3-butadiene in the presence of racemic cyclohexylmethylphenylphosphine (2) and exists in the form of two diastereomeric pairs of enantiomers 1a,b. The diastereomers have been fully characterized by NMR spectroscopic methods, with special focus on their stereochemistry. The molecular structure of 1b was determined by X-ray crystallography and confirmed the results of the NMR investigation: in both diastereomers the C8H12 chains exhibit the same rigid topology and thus represent an inherent chiral element in these intermediates originating from butadiene coupling. This is an essential prerequisite for subsequent enantioselective transformations of complexes of type 1.
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