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US 6,486,337 B2Granted
Ruthenium-disphosphine complexes and their use as catalysts
AssigneeChirotech Technology Limited
InventorsMark Joseph Burk, William Hems, Antonio Zanotti-Gerosa
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Abstract
The present invention concerns novel complexes, suitable in particular for use as catalysts in the asymmetric hydrogenation of ketones, of formula 1 or a diastereoisomer thereof, wherein each Ar is an aromatic or heteroaromatic group of up to 20 atoms; X is halide or carboxylate; and R1, R2, R3, and R4 are independently hydrogen, aryl or alkyl, optionally linked or part of a ring.
Claims25
An enantiomerically enriched ligand-RuX2-diamine complex of formula 1
- or a diastereoisomer thereof, wherein
- each Ar is an aromatic or heteroaromatic group of up to 20 atoms;
- X is halide or carboxylate;
- and
- R1, R2, R3, and R4 are independently hydrogen, aryl or alkyl, optionally linked or part of a ring.
2 more elements
Dependencies are inferred from the claim text.