US3903108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 2-arylindoles
Assignee: Eastman Kodak Co
•
Filing: 1974-05-01
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Granted: 1975-09-02
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Expires: 1994-05-01
Abstract
Abstract The production of 2-arylindoles from Alpha haloarylacetaldehyde dialkylacetals and primary or secondary aromatic amines is disclosed. These indoles are useful in the production of cationic dyestuffs having excellent properties.
Inventors
- 👤 Sr James J Krutak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:41
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
METHOD OF PREPARING A 2-ARYLINDOLE WHICH COMPRISES THE STEPS MIXING ONE MOLE PROPORATION OF AN A-HALOARYLACETALDEHYDE DIALKYLACETAL HAVING THE FORMULA
Claim 2
Dependent Claim
20 words
METHOD OF PREPARING A 2-ARYLINDOLE WHICH COMPRISES THE STEPS MIXING ONE MOLE PROPORATION OF AN A-HALOARYLACETALDEHYDE DIALKYLACETAL HAVING THE FORMULA
Claim 3
Dependent Claim
37 words
Method of claim 1 which comprises conducting the reaction in the presence of an aromatic organic solvent which is inert to both the reactants and the product, said solvent having a boiling point of between about 70*-200*C.
Claim 4
Dependent Claim
16 words
Method of claim 1 conducted in the presence of at least 2 mole proportions of amine.
Claim 5
Dependent Claim
16 words
Mehtod of claim 1 conducted in at least one mole proportion of a proton accepting reagent.
Claim 6
Dependent Claim
22 words
Method of claim 4 wherein the proton accepting reagent is selected from pyridine, triethylamine, dimethylpyridine and the alkali metal bicarbonates and carbonates.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |