US3883580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asymmetric reduction of ketones to form optically active alcohols
Assignee: Monsanto Co
•
Filing: 1972-02-09
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Granted: 1975-05-13
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Expires: 1992-02-09
Abstract
Abstract A process for producing optically active secondary alcohols by reducing an optically inactive ketone in the presence of an optically active Group VIII metal coordination complex catalyst is disclosed. One embodiment is directed to a process for forming optically active aliphatic or aromatic secondary alcohols by reacting an optically inactive ketone with hydrogen in the presence of a Group VIII metal complex catalyst which contains the metal in combination with at least one optically active phosphine or arsine ligand.
Inventors
- 👤 Arthur John Solodar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:11
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/132; C07C29/136; C07C29/143; C07C29/145; C07B; C07B2200/00; C07B2200/07
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
22 words
A PROCESS FOR PREPARING AN OPTICALLY ACTIVE SECONDARY ALCOHOL COMPRISING REACTING AN OPTICALLY INACTIVE KETONE HAVING NO ASYMMETRIC ATOMS OF THE FORMULA
Claim 2
Dependent Claim
22 words
A PROCESS FOR PREPARING AN OPTICALLY ACTIVE SECONDARY ALCOHOL COMPRISING REACTING AN OPTICALLY INACTIVE KETONE HAVING NO ASYMMETRIC ATOMS OF THE FORMULA
Claim 3
Dependent Claim
16 words
A process according to claim 1 where the Group VIII metal is ruthenium, rhodium or iridium.
Claim 4
Dependent Claim
13 words
A process according to claim 1 where the Group VIII metal is rhodium.
Claim 5
Dependent Claim
19 words
A process according to claim 1 wherein at least one of said optically active ligands is a phosphine ligand.
Claim 6
Dependent Claim
15 words
A process according to claim 1 wherein all of said ligand is a phosphine ligand.
Claim 7
Dependent Claim
33 words
A process according to claim 1 wherein the ratio of optically active phosphine or arsine ligand is from about 1.5 to about 2.9 eqUivalents of ligand per mole of said Group VIII metal.
Claim 8
Dependent Claim
16 words
A process according to claim 6 wherein said Group VIII metal is ruthenium, rhodium or iridium.
Claim 9
Dependent Claim
32 words
A process according to claim 6 wherein said Group VIII metal is the metallic component in a coordination metal complex containing two equivalents of phosphine or arsine ligand per mole of metal.
Claim 10
Dependent Claim
28 words
A process according to claim 8 wherein said optically active catalyst contains two olefinic ligands per mole of metal in addition to the two phosphine or arsine ligands.
Claim 11
Dependent Claim
15 words
A process according to claim 1 wherein said optically active catalyst is formed in situ.
Claim 12
Dependent Claim
66 words
A process according to claim 1 wherein said optically active catalyst is a coordination complex of the formula a. M1XnL3 or b. M2X2L2 where M1 is rhodium, ruthenium, iridium or osmium; M2 is palladium or platinum; X is hydrogen or halogen; n is the integer 1 or 3; and L is a phosphine or arsine ligand, provided that at least one L group is optically active.
Claim 13
Dependent Claim
22 words
A process according to claim 1 wherein said optically active catalyst is a solution of said Group VIII metal and said ligand.
Claim 14
Dependent Claim
18 words
A process according to claim 1 wherein the R groups of said ketone are substituted monovalent hydrocarbn groups.
Claim 15
Dependent Claim
14 words
A process according to claim 1 wherein said optically active secondary alcohol is 2-methylamino-1-(3''-hydroxyphenyl)-ethanol.
Claim 16
Dependent Claim
14 words
A process according to claim 1 wherein said optically active secondary alcohol is 3-(2''-methoxyphenoxy)-propane-1,2-diol.
Claim 17
Dependent Claim
14 words
A process according to claim 1 wherein said optically active secondary alcohol is 1-isopropylamino-3-(1''-naphthoxy)-2-propanol.
Claim 18
Dependent Claim
14 words
A process according to claim 1 wherein said optically active secondary alcohol is o-tolylphenylmethanol.
Claim 19
Dependent Claim
14 words
A process according to claim 1 wherein said optically active secondary alcohol is 1-carbamoyloxy-3-(2''-methoxyphenoxy)-2-propanol.
Claim 20
Dependent Claim
14 words
A process according to claim 1 wherein said optically active secondary alcohol is 1-carbamoyloxy-3-(4''-chlorophenoxy)-2-propanol.
References Cited (Backward Citations)
GB1138601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |