US5081280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of ester compounds
Assignee: Tanabe Pharma Corp
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Filing: 1989-03-07
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Granted: 1992-01-14
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Expires: 2009-03-07
Abstract
Abstract In producing ester compound useful as an antioxidant for organic materials which are represented by the formula: ##STR1## wherein R 1 and R 2 are the same or different and represent hydrogen or straight or branched chain alkyl radicals containing 1-8 carbon atoms, Z is an organic radical derived from an n-hydroxy alcohol, and n denotes an integer of 1 to 4, by transesterification, monoalkyltin compounds are used as a catalyst, whereby the ester compounds can be produced with high quality and in high yields.
Inventors
- 👤 Koichi Takee
- 👤 Masayoshi Gohbayashi
- 👤 Kunihide Oka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:41
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/03; C07C69/00; C07C69/66; C07C69/73; C07C69/732
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
A process for producing an ester compound of the formula: ##STR8## wherein R 1 and R 2 are the same or different and represent hydrogen or straight or branched chain alkyl radicals containing 1-8 carbon atoms, Z is an organic radical derived from an n-hydroxy alcohol, and n denotes an integer of 1 to 4, which comprises subjecting a compound of the formula: ##STR9## wherein R 1 and R 2 have the same definition as above, and R 3 is a straight or branched chain alkyl radical containing 1-8 carbon atoms, and a compound of the formula: Z--OH).sub.n wherein the respective symbols are the same as above, to transesterification in the presence of a monoalkyltin compound as a catalyst.
Claim 2
Dependent Claim
119 words
A process for producing an ester compound of the formula: ##STR8## wherein R 1 and R 2 are the same or different and represent hydrogen or straight or branched chain alkyl radicals containing 1-8 carbon atoms, Z is an organic radical derived from an n-hydroxy alcohol, and n denotes an integer of 1 to 4, which comprises subjecting a compound of the formula: ##STR9## wherein R 1 and R 2 have the same definition as above, and R 3 is a straight or branched chain alkyl radical containing 1-8 carbon atoms, and a compound of the formula: Z--OH).sub.n wherein the respective symbols are the same as above, to transesterification in the presence of a monoalkyltin compound as a catalyst.
Claim 3
Dependent Claim
32 words
The process as set forth in claim 1, wherein said monoalkyltin compound is selected from the group consisting of monoalkyltin oxides, monoalkyltin sulfides, monoalkyltin trihalides, monoalkyltin dihydroxyhalides, monoalkyltin tri-carboxylates, and monoalkyltin tris(alkylmercaptocarboxylates).
Claim 4
Dependent Claim
15 words
The process as set forth in claim 1, wherein said monoalkyltin compound is monobutyltin oxide.
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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) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |