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US3669979A
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Novel process for the production of 2-benzothiazolyl-phenol and derivatives thereof employing phosphorus trichloride as a catalyst
Assignee: GAF Chemicals Corp
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Filing: 1967-12-14
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Granted: 1972-06-13
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Expires: 1987-12-14
Abstract
Abstract A method of preparing heterocyclic derivatives selected from the formulae: WHEREIN X is selected from hydrogen, lower alkyl, lower alkoxy, and halogen; Y is selected from hydroxy and X; Z is selected from nitrogen, oxygen, and sulfur by reacting an o- aminobenzenethiol, o-aminophenol, or o- aminoaniline and substituted derivatives thereof with an ortho-substituted benzoic acid or 2-substituted naphtholic acid in the presence of a catalyst comprising phosphorus trichloride. The compounds produced by the process of the present invention are useful as stabilizers in various organic media, e.g., organic plastics, oils, etc. and as intermediates in the production of dyestuffs and fluorescent compounds.
Inventors
- 👤 Harlan B Freyermuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:09
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D263/57; C07D235/00; C07D235/02; C07D235/04; C07D235/18; C07D277/00; C07D277/60; C07D277/62; C07D277/64; C07D277/66
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
The process of claim 1 wherein said Compound I is o-aminobenzenethiol, and said Compound II is salicyclic acid, the desired heterocyclic derivative being 2-benzothiazolylphenol.
Claim 2
Dependent Claim
10 words
The process of claim 1 wherein said solvent is toluene.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein said solvent is dimethylaniline.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein said solvent is toluene.
Claim 5
Dependent Claim
10 words
The process of claim 2 wherein said solvent is dimethylaniline.
References Cited (Backward Citations)
US2985661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |