EP0052333A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
4-Fluoro-5-oxypyrazole derivate and preparation thereof
Assignee: Daikin Industries Ltd
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Filing: 1981-11-10
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Granted: —
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Expires: 2001-11-10
Abstract
Abstract 4-Fluoro-5-oxypyrazole derivative having the formula wherein R 1 represents hydrogen atom or a lower alkyl group: and R 2 represents a lower alkyl or phenyl group or a phenyl group having one or more substituent of fluorine or chlorine atom or a lower alkyl or dimethylamino group as effective intermediates for agricultural and pharmaceutical chemicals.
Inventors
- 👤 Nobuo Ishikawa
- 👤 Tomoya Kitazume
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 08:42
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
1) 4-Fluoro-5-oxypyrazole derivatives having the formula wherein R 1 represents hydrogen atom or a lower alkyl group; and R 2 represents a lower alkyl or phenyl group or a phenyl group having one or more substituent of fluorine or chlorine atom or a lower alkyl or dimethylamino group.
Claim 2
Dependent Claim
48 words
1) 4-Fluoro-5-oxypyrazole derivatives having the formula wherein R 1 represents hydrogen atom or a lower alkyl group; and R 2 represents a lower alkyl or phenyl group or a phenyl group having one or more substituent of fluorine or chlorine atom or a lower alkyl or dimethylamino group.
Claim 3
Dependent Claim
15 words
2) 4-Fluoro-5-oxypyrazole derivatives according to Claim 1 which are intermediates for pharmaceutical and agricultural chemicals.
Claim 4
Dependent Claim
36 words
3) 4-Fluoro-5-oxypyrazole derivatives according to Claim 1 which are (1) 3-phenyl-4-fluoro-5-oxypyrazole; (2) 1-methyl-3-phenyl-4-fluoro-5-oxypyrazole; (3) 1-methyl-3-(4-methylphenyl)-4-fluoro-5-oxypyrazole; (4) 1-methyl-3-(4-chlorophenyl)-4-fluoro-5-oxypyrazole-; (5) 1-methyl-3-(4-dimethylaminophenyl)-4-fluoro-5-oxypyrazole; (6) 1-methyl-3-(4-fluorophenyl)-4-fluoro-5-oxypyrazole; (7) 1-methyl-3-(3-methylphenyl)-4-fluoro-5-oxypyrazole; (8) 3-(4-methylphenyl)-4-fluoro-5-oxypyrazole; (9) 3-(4-chlorophenyl)-4-fluoro-5-oxypyrazole; (10) 3-inethyl-4-fluoro-5-oxypyrazole; (11) 1,3-dimethyl-4-fluoro-5-oxypyrazole; (12) 3-propyl-4-fluoro-5-oxypyrazole; and (13) 1-methyl-3-propyl-4-fluoro-5-oxypyrazole.
Claim 5
Dependent Claim
80 words
4) A process for producing 4-fluoro-5-oxypyrazole derivative having the formula wherein R 1 represents hydrogen atom or a lower alkyl group; and R 2 represents a lower alkyl or phenyl group or a phenyl group having one or more substituent of fluorine or chlorine atom or a lower alkyl or dimethylamino group which comprises reacting methyl hydrazine or hydrazine hydrate with an α-fluoro-β-ketoester having the formula wherein R 3 represents a lower alkyl group and R 2 is defined above.
Claim 6
Dependent Claim
80 words
4) A process for producing 4-fluoro-5-oxypyrazole derivative having the formula wherein R 1 represents hydrogen atom or a lower alkyl group; and R 2 represents a lower alkyl or phenyl group or a phenyl group having one or more substituent of fluorine or chlorine atom or a lower alkyl or dimethylamino group which comprises reacting methyl hydrazine or hydrazine hydrate with an α-fluoro-β-ketoester having the formula wherein R 3 represents a lower alkyl group and R 2 is defined above.
Claim 7
Dependent Claim
16 words
5) The process according to Claim 4 wherein the reaction is carried out in an alcohol.
Claim 8
Dependent Claim
17 words
6) The process according to Claim 4 wherein the reaction is carried out under a refluxing condition.
References Cited (Backward Citations)
DE2829289A1
Cited
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