US3963739A
Expired / Lapsed
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3-Amino-4,5,6-trichloro-7-nitriloindazoles
Assignee: Dynamit Nobel AG
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Filing: 1975-08-04
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Granted: 1976-06-15
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Expires: 1995-08-04
Abstract
Abstract A compound having the formula ##SPC1## Wherein R is hydrogen, a C 1-6 alkyl, a C 1-6 chloroalkyl, a phenyl or an alkyl-substituted phenyl radical, a process for preparing such compound by contacting tetrachlorisophthalic acid dinitrile with hydrazine or a hydrazine derivative of the formula H.sub.2 N--NHR in which R has the previously ascribed significance.
Inventors
- 👤 Klaus-Dieter Steffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:16
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/54; C07D231/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
In a method of preparing a 3-amino-4,5,6-trichloro-7-nitriloindazole of the general formula ##SPC5## wherein R represents hydrogen, alkyl of from 1 to 6 carbon atoms, chloroalkyl of from 1 to 6 carbon atoms, phenyl or alkyl-substituted phenyl, the alkyl portion of which is an alkyl of from 1 to 6 carbon atoms by contacting a tetrachloroisophthalicaciddinitrile having the formula ##SPC6## with a hydrazine compound of the formula H.sub.2 N-NHR the improvement which comprises carrying out said process at a temperature between 10° and 50°C in the presence of a solvent for the reaction mixture, which solvent is selected from the group consisting of dioxane, methyl alcohol, ethyl alcohol, o-dichlorobenzene, ethyl ether and toluene and thereafter recovering a
Claim 2
Dependent Claim
116 words
In a method of preparing a 3-amino-4,5,6-trichloro-7-nitriloindazole of the general formula ##SPC5## wherein R represents hydrogen, alkyl of from 1 to 6 carbon atoms, chloroalkyl of from 1 to 6 carbon atoms, phenyl or alkyl-substituted phenyl, the alkyl portion of which is an alkyl of from 1 to 6 carbon atoms by contacting a tetrachloroisophthalicaciddinitrile having the formula ##SPC6## with a hydrazine compound of the formula H.sub.2 N-NHR the improvement which comprises carrying out said process at a temperature between 10° and 50°C in the presence of a solvent for the reaction mixture, which solvent is selected from the group consisting of dioxane, methyl alcohol, ethyl alcohol, o-dichlorobenzene, ethyl ether and toluene and thereafter recovering a
Claim 3
Dependent Claim
12 words
Method according to claim 1 wherein the reaction is conducted in the
Claim 4
Dependent Claim
34 words
Method according to claim 1 wherein said 3-amino-4,5,6-trichloro-7-nitriloindazole is removed from the reaction mixture by initially precipitating the same by employing a solvent for the reaction in which the product is only poorly soluble.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |