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We have shown that the readily prepared (ferrocenyl)benzylic methyl ethers of type 1 can be ortho-metalated with tert-BuLi with high diastereoselectivity. This reaction has been used to prepare new borane-protected P,N-substituted ferrocenes of type 2 in high diastereomeric and enantiomeric purity. The chiral heterocyclic aminophosphines 2 may be of interest as chelating ligands for asymmetric metal catalysis.
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Lotz et al. (2000) studied this question.
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