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US4156776A
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US
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Sucrose derivatives
Assignee: Tate and Lyle PLC
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Filing: 1977-05-25
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Granted: 1979-05-29
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Expires: 1997-05-25
Abstract
Abstract A novel cyclic acetal derivative of sucrose, 4,6-O-isopropylidenesucrose, is prepared by treating sucrose with 2,2-dimethoxypropane in N,N-dimethylformamide, in the presence of p-toluenesulphonic acid, suitably at room temperature. The product is conveniently isolated in the form of its hexa-acetate or hexabenzoate, by treatment with acetic anhydride or benzoyl chloride, respectively, in pyridine. The resulting compounds are valuable as synthetic intermediates and in conformational investigations.
Inventors
- 👤 Khizar S. Mufti
- 👤 Riaz A. Khan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:34
CPC Classifications
C; C07; C07H; C07H9/00; C07H9/02; C07H9/04; C07H13/00; C07H13/02; C07H13/04; C07H13/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
1 words
4,6-O-Isopropylidenesucrose.
Claim 2
Dependent Claim
1 words
4,6-O-Isopropylidenesucrose.
Claim 3
Dependent Claim
2 words
4,6-O-Isopropylidenesucrose hexa-acetate.
Claim 4
Dependent Claim
2 words
4,6-O-Isopropylidenesucrose hexa-acetate.
Claim 5
Dependent Claim
2 words
4,6-O-Isopropylidenesucrose hexabenzoate.
Claim 6
Dependent Claim
2 words
4,6-O-Isopropylidenesucrose hexabenzoate.
Claim 7
Dependent Claim
19 words
A process for preparing 4,6-O-isopropylidenesucrose, which comprises treating sucrose with 2,2-dimethoxypropane in N,N-dimethylformamide in the presence of p-toluenesulphonic acid.
Claim 8
Dependent Claim
19 words
A process for preparing 4,6-O-isopropylidenesucrose, which comprises treating sucrose with 2,2-dimethoxypropane in N,N-dimethylformamide in the presence of p-toluenesulphonic acid.
Claim 9
Dependent Claim
32 words
The process of claim 4 wherein the 4,6-O-isopropylidenesucrose is isolated from the reaction mixture by esterifying said product, isolating the resulting ester and then de-esterifying the ester to regenerate the desired product.
Claim 10
Dependent Claim
19 words
The process of claim 5, wherein said product is esterified with benzoyl chloride so as to form 4,6-O-isopropylidenesucrose hexabenzoate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |