Patent US3622597A successfully refreshed from Google Patents.
US3622597A
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Method of preparing thiiranes from mercaptoalcohols
Assignee: Dow Chemical Co
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Filing: 1968-09-13
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Granted: 1971-11-23
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Expires: 1988-09-13
Abstract
Abstract The method comprises continuously adding mercaptoalcohols to a heated solution of a dehydration catalyst dissolved in a liquid diluent. The diluent and catalyst are of low volatility at the reaction temperature. The thiirane is continuously removed from the reaction mixture.
Inventors
- 👤 Jon E Fletcher
- 👤 Rodney A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:43
CPC Classifications
C; C07; C07D; C07D331/00; C07D331/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
11 words
The method of claim 1 in which the catalyst is H2SO4.
Claim 2
Dependent Claim
20 words
The method of claim 1 in which the catalyst is an alkanol sulfate or a sulfate of a polyalkyleneglycol ether.
Claim 3
Dependent Claim
29 words
The method of claim 1 in which the solvent is a polymer of molecular weight 200 - 4,000 of at least one epoxide having two to four C atoms.
Claim 4
Dependent Claim
48 words
The method of claim 1 in which the solvent is selected from the class consisting of mono- and diethers of polyalkylene oxides having two to six alkylene groups, each said alkylene group having two to four C atoms, and said ether group having one to four C. atoms.
Claim 5
Dependent Claim
19 words
The method of claim 1 in which the solvent is an alkanol of from 12 - 20 C atoms.
Claim 6
Dependent Claim
26 words
The method of claim 1 in which the catalyst concentration ranges from about 0.002 to about 0.2 acid equivalents per 100 parts by weight of solvent.
Claim 7
Dependent Claim
11 words
The method of claim 7 in which the catalyst is H2SO4.
Claim 8
Dependent Claim
19 words
The method of claim 1 in which the catalyst is an alkanol sulfate having two to 20 C atoms.
Claim 9
Dependent Claim
17 words
The method of claim 1 in which the reaction pressure ranges from 1 to 200 mm. Hg.
Claim 10
Dependent Claim
17 words
The method of claim 1 in which the mercaptoalcohol is mercaptoethanol and the thiirane is ethylene sulfide.
Claim 11
Dependent Claim
17 words
The method of claim 1 in which the mercaptoalcohol is mercaptopropanol and the thiirane is propylenE sulfide.
Claim 12
Dependent Claim
16 words
The method of claim 1 in which the mercaptoalcohol is 1-mercapto-2-butanol and the thiirane is 1,2-epithiobutane.
Claim 13
Dependent Claim
17 words
The method of claim 1 in which the mercaptoalcohol is 2,3-dimercapto-1-propanol and the thiirane is mercaptopropyl thiirane.
Claim 14
Dependent Claim
16 words
The method of claim 1 in which the mercaptoalcohol is 1-butoxy-3-mercapto-2-propanol and the thiirane is 1-butoxy-2,3-epithiopropane.
Claim 15
Dependent Claim
26 words
The method of claim 1 in which a mixture of mercaptoalcohols having two to four C atoms is dehydrated to form a mixture of corresponding thiiranes.
References Cited (Backward Citations)
US2436233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |