US4122115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of chloro- and bromo-fluoroacetyl chloride
Assignee: EIDP Inc
•
Filing: 1977-11-07
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Granted: 1978-10-24
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Expires: 1997-11-07
Abstract
Abstract An alkyl ester of a chloro- or bromo-fluoroacetic acid is reacted with chlorosulfonic acid to produce the corresponding acid chloride. Exemplary is the reaction of ethylchlorofluoroacetate with chlorosulfonic acid at 120°-200° C to produce chlorofluoroacetyl chloride.
Inventors
- 👤 William Joseph Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:43
CPC Classifications
C; C07; C07C; C07C53/00; C07C53/38; C07C53/46; C07C53/48; C07C51/00; C07C51/58; C07C51/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
40 words
The process of heating a compound of the formula CHFXCOOR wherein X = cl or Br and R = alkyl of 1-4 carbons with chlorosulfonic acid at a temperature of 70°-250° C. and recovering a compound of the formula CHFXCOCl.
Claim 2
Dependent Claim
40 words
The process of heating a compound of the formula CHFXCOOR wherein X = cl or Br and R = alkyl of 1-4 carbons with chlorosulfonic acid at a temperature of 70°-250° C. and recovering a compound of the formula CHFXCOCl.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the temperature is 70°-200° C.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein an aromatic carboxylic acid chloride is present during the heating.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein phthaloyl chloride is present.
Claim 6
Dependent Claim
10 words
The process of claim 3 wherein benzoyl chloride is present.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the starting ester is ethyl chlorofluoroacetate.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the starting ester is ethyl bromofluoroacetate.
References Cited (Backward Citations)
GB679185A
Cited
US3742047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |