US3899520A
Expired / Lapsed
US
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Stannous catechol derivatives and process for preparing them
Assignee: Olin Corp
•
Filing: 1973-07-02
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Granted: 1975-08-12
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Expires: 1993-07-02
Abstract
Abstract A process for the preparation of stannous catechol derivatives by the reaction of a catechol with a stannous carboxylate is disclosed. Selected novel derivatives are prepared by this process which are useful as gel catalysts in the production of flexible urethane foams.
Inventors
- 👤 Leuwen Bruce G Van
- 👤 James J Pitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/24; C07; C07F; C07F7/00; C07F7/003
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
23 words
A PROCESS FOR PREPARING STANNOUS CATECHOL DERIVATIVES WHICH COMPRISES REACTING, IN THE PRESENCE OF AN INERT ORGANIC SOLVENT, A CATECHOL OF THE FORMULA:
Claim 2
Dependent Claim
23 words
A PROCESS FOR PREPARING STANNOUS CATECHOL DERIVATIVES WHICH COMPRISES REACTING, IN THE PRESENCE OF AN INERT ORGANIC SOLVENT, A CATECHOL OF THE FORMULA:
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein R4 is selected from the group consisting of alkyl having from about 5 to about 9 carbon atoms and alkenyl having from about 5 to about 9 carbon atoms.
Claim 4
Dependent Claim
50 words
The process of claim 2 wherein each of R, R1, R2 and R3 is independently selected from the group consisting of hydrogen, halogen selected from the group consisting of chlorine and bromine, nitro, alkyl having 1 to about 4 carbon atoms and alkoxy having 1 to about 4 carbon atoms.
Claim 5
Dependent Claim
21 words
The process of claim 3 wherein said inert organic solvent has a boiling point of from about 30* to about 90*C.
Claim 6
Dependent Claim
26 words
The process of claim 4 wherein said inert solvent is selected from the group consisting of diethyl ether, acetone, dioxane, methanol, methyl ethyl ketone and ethanol.
Claim 7
Dependent Claim
21 words
The process of claim 5 wherein said reaction is carried out at a temperature of from about 20* to about 40*C.
Claim 8
Dependent Claim
24 words
The process of claim 6 wherein said catechol is selected from the group consisting of tetrabromo catechol, nitro catechol, methyl catechol and tert-butyl catechol.
Claim 9
Dependent Claim
23 words
The process of claim 7 in which said stannous carboxylate is selected from the group consisting of stannous octanoate and stannous 2-ethyl hexanoate.
Claim 10
Dependent Claim
10 words
A STANNOUS CATECHOL DERIVATIVE REPRESENTED BY THE FORMULA SELECTED FROM
Claim 11
Dependent Claim
10 words
A STANNOUS CATECHOL DERIVATIVE REPRESENTED BY THE FORMULA SELECTED FROM
Claim 12
Dependent Claim
11 words
The stannous catechol derivative of claim 9 wherein R6 is hydrogen.
Claim 13
Dependent Claim
33 words
The stannous catechol derivative of claim 10 wherein R4 is an alkyl having from 5 to about 9 carbon atoms and R5 is an alkyl having from 1 to about 4 carbon atoms.
Claim 14
Dependent Claim
39 words
The stannous catechol derivative of claim 11 selected from the group consisting of (2-hydroxy-3-methoxyphenolato (1-)) tin (II) octanoate, (2hydroxy-6-methoxyphenolato (1-)) tin (II) octanoate, (2-hydroxy-3-methoxyphenolato (1-)) tin (II) ethylhexanoate, (2-hydroxy-6-methoxyphenolato (1-)) tin (II) ethylhexanoate and (2-hydroxy-3-methoxyphenolato (1-)) tin (II) hexanoate.
Claim 15
Dependent Claim
14 words
The stannous catechol derivative of claim 12 identified as (2-hydroxy-3-methoxyphenolato (1-)) tin (II) octanoate.
References Cited (Backward Citations)
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US2831898A
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US3214453A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |