Transfer hydrogenation process and catalyst
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United States of America Patent
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Apr 8, 2003
Grant Date -
Oct 24, 2002
app pub date -
Feb 27, 2002
filing date -
Mar 26, 1997
priority date (Note) -
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Abstract
A catalytic transfer hydrogenation process is provided. The catalyst employed in the process is a metal cyclopentadienyl complex which is coordinated to defined bidentate ligands. Preferred metals include rhodium, ruthenium and iridium. Preferred bidentate ligands are diamines and aminoalcohols, particularly those comprising chiral centers. The hydrogen donor is advantageously a secondary alcohol or a mixture of triethylamine and formic acid. The process can be employed to transfer hydrogenate ketones and imines, which are preferably prochiral. Catalysts for use in such a process are also provided.
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