US3985762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of 2-alkylsulfinyl-6-nitrobenz-thiazoles
Assignee: Hoechst AG
•
Filing: 1975-01-02
•
Granted: 1976-10-12
•
Expires: 1995-01-02
Abstract
Abstract 2-Alkylsulfinyl-6-nitrobenzthiazoles of the formula ##SPC1## In which R is alkyl having from 1 to 10 carbon atoms are prepared by reacting 2-alkylmercaptobenzthiazoles of the formula ##SPC2## With at least 2 moles of fuming nitric acid in at least 300 grams of sulfuric acid, of at least 90 % strength, per mole of benzthiazole.
Inventors
- 👤 Gunter Karl Wilhelm Otto Dransch, deceased
- 👤 heiress by Annelise Klara Helene Wiesenhutter
- 👤 heiress by Johanna Mathilde Flersheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:36
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/60; C07D277/62; C07D277/68; C07D277/70; C07D277/76
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A process for the manufacture of a 2-alkylsulfinyl-6-nitrobenzthiazole of the formula I ##SPC5## in which R is alkyl having from 1 to 6 carbon atoms, which comprises reacting, at a temperature of from 0° to 45° C, a 2-alkylmercaptobenzthiazole of the formula II ##SPC6## with at least 2 moles of fuming nitric acid in at least 300 grams of sulfuric acid, of at least 90 % strength, per mole of benzthiazole.
Claim 2
Dependent Claim
71 words
A process for the manufacture of a 2-alkylsulfinyl-6-nitrobenzthiazole of the formula I ##SPC5## in which R is alkyl having from 1 to 6 carbon atoms, which comprises reacting, at a temperature of from 0° to 45° C, a 2-alkylmercaptobenzthiazole of the formula II ##SPC6## with at least 2 moles of fuming nitric acid in at least 300 grams of sulfuric acid, of at least 90 % strength, per mole of benzthiazole.
Claim 3
Dependent Claim
53 words
A process as claimed in claim 1, wherein the compound of formula II is first nitrated at about 0° to 5° C with an excess of concentrated nitric acid and sulfuric acid and the 2-alkylmercapto-6-nitrobenzthiazole obtained is then oxidized at 0°-45° C with a mixture of fuming nitric acid and concentrated sulfuric acid.
Claim 4
Dependent Claim
30 words
A process as claimed in claim 2, wherein the nitration of the compound of formula II is carried out with fuming nitric acid in the presence of concentrated sulfuric acid.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |