Patent US3386580A successfully refreshed from Google Patents.
Patent US5198575A successfully refreshed from Google Patents.
US5198575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nitrobenzoic and anthranilic acids
Assignee: BASF SE
•
Filing: 1992-07-13
•
Granted: 1993-03-30
•
Expires: 2012-07-13
Abstract
Abstract Nitrobenzoic acids I ##STR1## (X 1 , X 2 =fluorine, chlorine, bromine, hydrogen or nitro) are prepared by oxidizing the corresponding nitrotoluene II ##STR2## with nitric acid in the presence of sulfuric acid and vanadium(V) compounds, and anthranilic acids III ##STR3## (Y 1 , Y 2 =fluorine, chlorine, bromine, hydrogen or amino) are prepared from the nitrobenzoic acids I by reduction.
Inventors
- 👤 Helmut Hagen
- 👤 Jacques Dupuis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:01
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/12; C07C227/00; C07C227/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
A process for preparing nitrobenzoic acids of the general formula I ##STR10## where X 1 and X 2 are each fluorine, chlorine, bromine, hydrogen or nitro, by oxidizing the corresponding nitrotoluene of the general formula II ##STR11## with nitric acid, which comprises carrying out the oxidation in the presence of sulfuric acid and vanadium(V) compounds.
Claim 2
Dependent Claim
55 words
A process for preparing nitrobenzoic acids of the general formula I ##STR10## where X 1 and X 2 are each fluorine, chlorine, bromine, hydrogen or nitro, by oxidizing the corresponding nitrotoluene of the general formula II ##STR11## with nitric acid, which comprises carrying out the oxidation in the presence of sulfuric acid and vanadium(V) compounds.
Claim 3
Dependent Claim
87 words
A process for preparing anthranilic acids of the general formula III ##STR12## where Y 1 and Y 2 are each fluorine, chlorine, bromine, hydrogen or amino, by oxidizing the corresponding nitrotoluene of the general formula II ##STR13## where X 1 and X 2 are each fluorine, chlorine, bromine, hydrogen or nitro, with nitric acid to obtain nitrobenzoic acid of the general formula I ##STR14## and isolating and subsequently reducing this nitrobenzoic acid, which comprises carrying out the oxidation in the presence of sulfuric acid and vanadium(V) compounds.
Claim 4
Dependent Claim
87 words
A process for preparing anthranilic acids of the general formula III ##STR12## where Y 1 and Y 2 are each fluorine, chlorine, bromine, hydrogen or amino, by oxidizing the corresponding nitrotoluene of the general formula II ##STR13## where X 1 and X 2 are each fluorine, chlorine, bromine, hydrogen or nitro, with nitric acid to obtain nitrobenzoic acid of the general formula I ##STR14## and isolating and subsequently reducing this nitrobenzoic acid, which comprises carrying out the oxidation in the presence of sulfuric acid and vanadium(V) compounds.
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) | 1996-03-29 | 1996-09-28 | 1997-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-29 | 2000-09-28 | 2001-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-29 | 2004-09-28 | 2005-03-30 | $7700.00 | Window Closed / Lapsed |