Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Reexamination Certificate
2005-11-29
2005-11-29
Lorengo, J. A. (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
C556S013000, C556S021000
Reexamination Certificate
active
06969694
ABSTRACT:
Chiral ligands and transition metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The chiral ligands include (R,S,S,R)-DIOP*. The ruthenium complex reduces enamide to the corresponding amine with up to 99% enantioselectivity. The transition metal complexes of the chiral ligands are useful in asymmetric reactions such as asymmetric hydrogenation, hydride transfer, hydrosilylation, hydroboration, hydrovinylation, hydroformylation, hydrocarboxylation, isomerization, allylic alkylation, cyclopropanation, Diels-Alder reaction, Heck reaction, isomerization, Aldol reaction, Michael addition and epoxidation reactions.The chiral ligands are of the formulathe identittes of the R, R′ and Y groups are defined herein.
REFERENCES:
patent: 4542120 (1985-09-01), Hsu et al.
patent: 6576772 (2003-06-01), Zhang
patent: 2005/0014633 (2005-01-01), Chan et al.
Lorengo J. A.
Ohlandt Greeley Ruggiero & Perle L.L.P.
Pasterczyk J.
The Penn State Research Foundation
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