Chiral phosphorus-based ligands
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United States of America Patent
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Dec 5, 2000
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N/A
app pub date -
May 29, 1998
filing date -
May 30, 1997
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Expired
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Abstract
A chiral phosphorus-based ligand, in single enantiomer form, which is capable of complexing a transition metal atom and of acting as a ligand in asymmetric chemical catalysts, which comprises the partial structure R.sup.1 R.sup.2 P--O--C--X--Y--C--O--PR.sup.1 R.sup.2 (I) wherein each of X and Y is C or a heteroatom; the C--X--Y--C chain forms part of a linearly-fused bicyclic structure; and either R.sup.1 and R.sup.2 are each independently H or an organic group of up to 20 carbon atoms, including alkyl, fluoroalkyl, aryl, alkylaryl, alkoxy, aryloxy, and alkylaryloxy, or PR.sup.1 R.sup.2 is cyclic such that R.sup.1 and R.sup.2 are covalently linked, optionally with additional substituents.
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