Patent US4071520A successfully refreshed from Google Patents.
US4071520A
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Method for preparing carbostyril derivatives
Assignee: IMC Chemical Group Inc
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Filing: 1976-05-24
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Granted: 1978-01-31
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Expires: 1996-05-24
Abstract
Abstract Carbostyril derivatives useful as coccidiostats are prepared by reacting an ortho-halo benzaldehyde with a 2-alkyl-2-oxazoline, then heating at above about 200° C thereby forming the carbostyril.
Inventors
- 👤 Herbert Louis Wehrmeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:07
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/22; C07D215/227; C07D215/18; C07D215/38
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
A method for preparing carbostyril derivatives represented by the formula: ##STR8## where R is 5 or 7-chloro, or 7-dimethylamino and R 1 is hydrogen, methyl, phenyl, p-methoxyphenyl, acetamido or 2,4-dichlorophenoxy with the proviso that when R is 7-chloro, R 1 cannot be hydrogen comprising the step of heating at 200°-220° C a phenylethenyl oxazoline represented by the formula ##STR9## wherein X is a chlorine or bromine atom and R and R 1 have the same meanings defined above until said carbostyril derivative is formed.
Claim 2
Independent Claim
84 words
A method for preparing carbostyril derivatives represented by the formula: ##STR8## where R is 5 or 7-chloro, or 7-dimethylamino and R 1 is hydrogen, methyl, phenyl, p-methoxyphenyl, acetamido or 2,4-dichlorophenoxy with the proviso that when R is 7-chloro, R 1 cannot be hydrogen comprising the step of heating at 200°-220° C a phenylethenyl oxazoline represented by the formula ##STR9## wherein X is a chlorine or bromine atom and R and R 1 have the same meanings defined above until said carbostyril derivative is formed.
Claim 3
Dependent Claim
9 words
The method of claim 1 wherein R is chloro.
Claim 4
Dependent Claim
9 words
The method of claim 1 wherein R is dimethylamino.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein R 1 is hydrogen.
Claim 6
Dependent Claim
10 words
The method of claim 1 wherein R 1 is methyl.
Claim 7
Dependent Claim
10 words
The method of claim 1 wherein R 1 is phenyl.
Claim 8
Dependent Claim
10 words
The method of claim 1 wherein R 1 is p-methoxyphenyl.
Claim 9
Dependent Claim
10 words
The method of claim 1 wherein R 1 is acetamido.
Claim 10
Dependent Claim
10 words
The method of claim 1 wherein R 1 is 2,4-dichlorophenoxy.
Claim 11
Dependent Claim
9 words
The method of claim 1 wherein X is chlorine.
Claim 12
Dependent Claim
9 words
The method of claim 1 wherein X is bromine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |