US4454345A
Expired / Lapsed
US
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Process for preparing 2,5-dichloro-3-nitrobenzoic acid
Assignee: Rhone Poulenc Nederland BV
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Filing: 1979-09-27
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Granted: 1984-06-12
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Expires: 1999-09-27
Abstract
Abstract The invention relates to a process of preparing 2,5-dichloro-3-nitrobenzoic acid by reacting 1,4-dimethyl-2,5-dichloro-3-nitrobenzene with aqueous nitric acid.
Inventors
- 👤 Albert M. V. Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:22
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
24 words
A method of preparing 2,5-dichloro-3-nitrobenzoic acid which comprises reacting 1,4-dimethyl-2,5-dichloro-3-nitrobenzene with aqueous nitric acid at a reaction temperature of at least about 150° C.
Claim 2
Independent Claim
24 words
A method of preparing 2,5-dichloro-3-nitrobenzoic acid which comprises reacting 1,4-dimethyl-2,5-dichloro-3-nitrobenzene with aqueous nitric acid at a reaction temperature of at least about 150° C.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the reaction temperature is between about 150° C. and about 210° C.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the reaction temperature is between about 160° C. and about 200° C.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein the aqueous nitric acid comprises from about 10 to about 50 weight percent nitric acid based on the total amount of nitric acid and water in said aqueous nitric acid.
Claim 6
Dependent Claim
36 words
The method of claim 4 wherein the aqueous nitric acid comprises from about 15 to about 30 weight percent nitric acid based on the total amount of nitric acid and water in said aqueous nitric acid.
Claim 7
Dependent Claim
37 words
The method of claim 1 wherein the aqueous nitric acid is present in an amount of from about 85 to about 99 weight percent based upon the total weight of said aqueous nitric acid plus said 1,4-dimethyl-2,5-dichloro-3-nitrobenzene.
Claim 8
Dependent Claim
37 words
The method of claim 6 wherein the aqueous nitric acid is present in an amount of from about 90 to about 98 weight percent based upon the total weight of said aqueous nitric acid plus said 1,4-dimethyl-2,5-dichloro-3nitrobenzene.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |