Patent US4620949A successfully refreshed from Google Patents.
US4620949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for amidocarbonylation of cyclic amides
Assignee: Texaco Inc
•
Filing: 1985-04-05
•
Granted: 1986-11-04
•
Expires: 2005-04-05
Abstract
Abstract Amino acid derivatives are synthesized by reacting paraformaldehyde, cyclic amides and synthesis gas with a bimetallic catalyst comprising a rhodium-containing compound and a cobalt-containing compound, optionally in the presence of a solvent at a pressure of at least 500 psi and a temperature of at least 50° C. The novel amino acid products may be hydrolyzed to amino dicarboxylic acids or used as monomers to polyamides.
Inventors
- 👤 Jiang-Jen Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:57
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/27; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10; C08; C08G; C08G69/00; C08G69/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
59 words
A process for producing cyclic-amido acetic acid derivatives which comprises reacting a C 4 to C 6 cyclic amide, an aldehyde comprising formaldehyde or paraformaldehyde and synthesis gas with a bimetallic catalyst comprising a rhodium-containing compound and a cobalt-containing compound in a solvent at a pressure of at least 500 psi and a temperature of at least 50° C.
Claim 2
Dependent Claim
59 words
A process for producing cyclic-amido acetic acid derivatives which comprises reacting a C 4 to C 6 cyclic amide, an aldehyde comprising formaldehyde or paraformaldehyde and synthesis gas with a bimetallic catalyst comprising a rhodium-containing compound and a cobalt-containing compound in a solvent at a pressure of at least 500 psi and a temperature of at least 50° C.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the aldehyde is paraformaldehyde.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the cyclic amide is selected from the group consisting of 2-pyrrolidinone, ε-caprolactam and γ-valerolactam.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein the cyclic amide is selected from the group consisting of 2-pyrrolidinone and ε-caprolactam.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein the rhodium-containing compound is selected from the group consisting of a rhodium carbonyl, a rhodium halide, and hydridorhodium tris(triphenylphosphine)carbonyl.
Claim 7
Dependent Claim
24 words
The process of claim 5 wherein the rhodium-containing compound is selected from the group consisting of hydridorhodium tris-triphenylphosphine carbonyl, rhodium(III) acetylacetonate and rhodium(III) chloride.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein the rhodium-containing compound is hydridorhodium tris-(triphenylphosphine)carbonyl.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein the cobalt-containing compound is selected from the group consisting of cobalt carbonyls, cobalt halides and cobalt acetate.
Claim 10
Dependent Claim
25 words
The process of claim 8 wherein the cobalt-containing compound is selected from the group consisting of dicobalt octacarbonyl, cobalt(II) acetate, cobalt(II) chloride and cobalt(II) bromide.
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein the cobalt-containing compound is dicobalt octacarbonyl.
Claim 12
Dependent Claim
21 words
The process of claim 1 wherein the solvent is selected from the group consisting of methyl acetate, ethyl acetate and p-dioxane.
Claim 13
Dependent Claim
15 words
The process of claim 1 wherein the pressure is from 800 psi to 4000 psi.
Claim 14
Dependent Claim
15 words
The process of claim 1 wherein the temperature is from 80° C. to 150° C.
Claim 15
Dependent Claim
19 words
The process of claim 1 wherein the carbon monoxide to hydrogen ratio is in the range 5:1 to 1:5.
Claim 16
Dependent Claim
18 words
The process of claim 1 wherein the rhodium to cobalt ratio is in the range 1:1 to 1:1000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |