Metallocene-based chiral phosphine or arsine ligands
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United States of America Patent
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Aug 9, 2011
Grant Date -
Jul 12, 2007
app pub date -
Jan 14, 2005
filing date -
Jan 14, 2004
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Expired
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Abstract
The present invention relates to metallocene-based phosphine ligands having chirality at phosphorus and at least one other element of chirality (planar chirality and/or chirality at carbon); and to the use of such ligands in asymmetric transformation reactions to generate high enantiomeric excesses of formed compounds. A method for the preparation of ligands according to the invention involving the conversion of the ortho-lithiated substituted metallocene to a phosphine chiral at phosphorus is also disclosed.
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