Patent US4020176A successfully refreshed from Google Patents.
US4020176A
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Highly fluorinated diazides and process therefor
Assignee: Polaroid Corp
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Filing: 1975-07-14
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Granted: 1977-04-26
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Expires: 1995-07-14
Abstract
Abstract This invention relates to highly fluorinated diazides of the formula N 3 CH 2 (CF 2 ) x CH 2 N 3 wherein x is a positive integer from 2 to 12; to the preparation of these diazides by the reaction of excess sodium azide with a ditosylate of the formula C 7 H 7 SO 3 CH 2 (CF 2 ) x CH 2 O 3 SC 7 H 7 wherein x has the same meaning given above; and to the synthesis of highly fluorinated primary diamines of the formula H 2 NCH 2 (CF 2 ) x CH 2 NH 2 wherein x has the same meaning given above by catalytic hydrogenation of said diazides.
Inventors
- 👤 Richard B. Greenwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:19
CPC Classifications
C; C07; C07C; C07C247/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
A compound of the formula N.sub.3 CH.sub.2 (CF.sub.2).sub.x CH.sub.2 N.sub.3 wherein x is a positive integer from 2 to 12.
Claim 2
Dependent Claim
20 words
A compound of the formula N.sub.3 CH.sub.2 (CF.sub.2).sub.x CH.sub.2 N.sub.3 wherein x is a positive integer from 2 to 12.
Claim 3
Dependent Claim
11 words
A compound as defined in claim 1 wherein x is 3.
Claim 4
Dependent Claim
11 words
A compound as defined in claim 1 wherein x is 4.
Claim 5
Independent Claim
63 words
A method which comprises reacting (a) one molar equivalent of a ditosylate having the formula ##STR3## wherein x is a positive integer from 2 to 12 and (b) at least 2 molar equivalents of sodium azide in hexamethylphosphoric triamide at elevated temperature to yield the corresponding diazide having the formula N.sub.3 CH.sub.2 (CF.sub.2).sub.x CH.sub.2 N.sub.3 wherein x has the same meaning given above.
Claim 6
Independent Claim
63 words
A method which comprises reacting (a) one molar equivalent of a ditosylate having the formula ##STR3## wherein x is a positive integer from 2 to 12 and (b) at least 2 molar equivalents of sodium azide in hexamethylphosphoric triamide at elevated temperature to yield the corresponding diazide having the formula N.sub.3 CH.sub.2 (CF.sub.2).sub.x CH.sub.2 N.sub.3 wherein x has the same meaning given above.
Claim 7
Dependent Claim
11 words
A method as defined in claim 4 wherein x is 3.
Claim 8
Dependent Claim
11 words
A method as defined in claim 4 wherein x is 4.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |