US4217449A
Expired / Lapsed
US
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Process for the preparation of bis-triazolylstilbenes
Assignee: Bayer AG
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Filing: 1978-10-11
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Granted: 1980-08-12
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Expires: 1998-10-11
Abstract
Abstract Process for the preparation of bis-triazolylstilbene compounds which, in the form of the free acid, correspond to the formula ##STR1## wherein the phenyl radicals A can be substituted by halogen, C 1 -C 4 -alkyl or C 1 -C 4 -alkoxy, from bis-hydroxyiminohydrazonostilbene compounds of the formula ##STR2## characterized in that the bis-hyroxyiminohydrazonostilbene compounds are reacted with anhydrides of lower carboxylic acids in the presence of urea and polar solvents at temperatures from 10° to 60° C.
Inventors
- 👤 Alfons Dorlars
- 👤 Otto Neuner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:37
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/02; C07D249/04; C07D249/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
In the reaction of a bis-hydroxyiminohydrazonostilbene compound of the formula ##STR5## wherein the phenyl radicals A can be substituted by halogen, C 1 -C 4 -alkyl or C 1 -C 4 -alkoxy, with a cyclizing agent to produce the corresponding bis-triazolylstilbene compound of the formula ##STR6## the improvement wherein the cyclizing agent is a lower carboxylic acid anhydride and the reaction is effected in the presence of urea and a polar solvent at from 10° to 60° C.
Claim 2
Dependent Claim
78 words
In the reaction of a bis-hydroxyiminohydrazonostilbene compound of the formula ##STR5## wherein the phenyl radicals A can be substituted by halogen, C 1 -C 4 -alkyl or C 1 -C 4 -alkoxy, with a cyclizing agent to produce the corresponding bis-triazolylstilbene compound of the formula ##STR6## the improvement wherein the cyclizing agent is a lower carboxylic acid anhydride and the reaction is effected in the presence of urea and a polar solvent at from 10° to 60° C.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein the temperature is from 25° to 45° C.
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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |