US3759932A
Expired / Lapsed
US
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Method for preparing mercaptopyridines using alkali metal polysulfides
Assignee: Olin Corp
•
Filing: 1972-08-25
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Granted: 1973-09-18
•
Expires: 1992-08-25
Abstract
Abstract This invention relates to an improved and economical method for preparing mercaptopyridines by reaction of selected halosubstituted pyridines with an alkali metal polysulfide.
Inventors
- 👤 D Gavin
- 👤 M Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:28
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/70; C07D213/89
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
18 words
The method of claim 1 wherein in said polysulfide formula x is from about 3 to about 8.
Claim 2
Dependent Claim
18 words
The method of claim 1 wherein in said polysulfide formula x is from about 4 to about 8.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein a solution of said alkali metal polysulfide compound is used.
Claim 4
Dependent Claim
56 words
The method of claim 4, wherein the alkali metal polysulfide solution is formed by adding alkali metal sulfide to sulfur in aqueous solution in the ratio of 1:1 to 4:1 parts by weight of alkali metal sulfide to said halosubstituted pyridine compound and 1:1 to 20:1 parts by weight of sulfur to said halosubstituted pyridine compound.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein said halosubstituted pyridine compound is 2-chloropyridine.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein said halosubstituted pyridine compound is 2-bromopyridine.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the halosubstituted pyridine has halogens in any of the 2, 4 or 6 positions.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein said alkali metal polysulfide is sodium polysulfide.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein the N-oxide of said halosubstituted pyridine compound is used.
Claim 10
Dependent Claim
12 words
The method of claim 10 wherein said halosubstituted N-oxide compound is 2-chloropyridine-N-oxide.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein the acid salt of said halosubstituted pyridine compounds is used.
Claim 12
Dependent Claim
14 words
The method of claim 12 wherein said halosubstituted acid salt compound is 4-chloropyridine hydrochloride.
References Cited (Backward Citations)
US1753658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |