US3943136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 3,3-thiobis (2-methoxy-1-azabenzanthrone
Assignee: Montedison SpA
•
Filing: 1974-08-21
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Granted: 1976-03-09
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Expires: 1994-08-21
Abstract
Abstract A new process for preparing 3,3 - thio - bis[2-Methoxy-1-azabenzanthrone], a useful intermediate in the synthesis of dyestuffs, is disclosed. The process involves reacting 2-methoxy-1-azabenzanthrone with sulfur chlorides in suspension or solution in an inert solvent under heating, and recovering the reaction product from the reaction mass, e.g., by filtering.
Inventors
- 👤 Giuseppe Ribaldone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:12
CPC Classifications
C; C07; C07D; C07D221/00; C07D221/02; C07D221/04; C07D221/18; C09; C09B; C09B5/00; C09B5/02; C09B5/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
41 words
A process for preparing 3,3-thiobis [2-methoxy-1-azabenzanthrone], comprising reacting 2-methoxy-1-azabenzanthrone with sulfur chlorides in inert solvents selected from the group consisting of chlorinated saturated aliphatic hydrocarbons C 1 - C 2 , dimethylformamide and nitrobenzene, at a temperature of from 40°to 100°C.
Claim 2
Dependent Claim
41 words
A process for preparing 3,3-thiobis [2-methoxy-1-azabenzanthrone], comprising reacting 2-methoxy-1-azabenzanthrone with sulfur chlorides in inert solvents selected from the group consisting of chlorinated saturated aliphatic hydrocarbons C 1 - C 2 , dimethylformamide and nitrobenzene, at a temperature of from 40°to 100°C.
Claim 3
Dependent Claim
15 words
The process according to claim 1, in which the sulfur chloride is SCl 2 .
Claim 4
Dependent Claim
17 words
The process according to claim 1, in which the sulfur chloride is S 2 Cl 2 .
Claim 5
Dependent Claim
17 words
The process according to claim 1, in which the reaction solvent is CH 2 Cl 2 .
Claim 6
Dependent Claim
15 words
The process according to claim 1, in which the reaction solvent is CHCl 3 .
Claim 7
Dependent Claim
15 words
The process according to claim 1, in which the reaction solvent is CCL 4 .
Claim 8
Dependent Claim
19 words
The process according to claim 1, in which the reaction solvent is C 2 H 4 Cl 2 .
Claim 9
Dependent Claim
13 words
The process according to claim 1, in which the reaction solvent is tetrachloroethane.
References Cited (Backward Citations)
US3242184A
Cited
US3678053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |