US4845276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dialkoxybenzoic acid
Assignee: MSA Safety Inc
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Filing: 1988-08-22
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Granted: 1989-07-04
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Expires: 2008-08-22
Abstract
Abstract 2,6-dialkoxybenzoic acid is made by metalation of 1,3-dialkoxybenzene by reaction with potassium dialkylamide. The metalated dialkoxybenzene is carbonated and acidified to form the dialkoxybenzoic acid.
Inventors
- 👤 Lin-Chen Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:08
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/15
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
A method of preparing 2,6-dialkoxybenzoic acid comprising the step of metalating 1,3-dialkoxybenzene by reaction of 1,3-dialkoxybenzene where each alkoxy group independently contains up to 5 carbon atoms, with a potassium dialkylamide, in which each alkyl group is a lower alkyl group or cycloalkyl group containing up to six carbon atoms.
Claim 2
Independent Claim
50 words
A method of preparing 2,6-dialkoxybenzoic acid comprising the step of metalating 1,3-dialkoxybenzene by reaction of 1,3-dialkoxybenzene where each alkoxy group independently contains up to 5 carbon atoms, with a potassium dialkylamide, in which each alkyl group is a lower alkyl group or cycloalkyl group containing up to six carbon atoms.
Claim 3
Dependent Claim
22 words
A method of claim 1 in which the metalated dialkoxybenzene is treated with carbon dioxide and an acid to form 2,6-dialkoybenzoic acid.
Claim 4
Dependent Claim
11 words
A method of claim 1 comprising reacting 1,3-dimethoxybenzene and potassium diethylamide.
References Cited (Backward Citations)
DE661555C
Cited
US2816918A
Cited
US4590291A
Cited
US4730083A
Cited
JPH0210043A
Cited
JPH104034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |