Phosphorus p-cyclophane ligands and their use in transition metal catalyzed asymmetric reactions
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United States of America Patent
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Sep 2, 2003
Grant Date -
Oct 17, 2002
app pub date -
Jan 22, 2002
filing date -
Jan 19, 2001
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Expired
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Abstract
Chiral di-phosphonites and phosphhours diamides based on the ps-ortho disubstituted p-cyclophane skeleton are good ligands for transition metals, notably rhodium, iridium and ruthenium. Preferably, the transition metals are linked to the ligands by a diene compound chosen from 2,5-Norbornadiene (NBD) and 1,5-Cyclooctadiene (COD).
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