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A chelating dinitrogen ligand based on the bispidine skeleton is shown to restrict the conformational freedom of small, acyclic π-allyl ligands in palladium complexes. The π-allyl ligand is locked into one single rotamer by entirely steric interactions. These interactions do not require the presence of bulky substituents on the π-allyl ligand. The geometry of these complexes has been investigated by NMR spectroscopy in combination with semiempirical calculations.
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Gogoll et al. (1998) studied this question.
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