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US3910985A
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Process for preparing fluoroanilines
Assignee: Shell USA Inc
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Filing: 1974-07-15
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Granted: 1975-10-07
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Expires: 1994-07-15
Abstract
Abstract Nitrobenzenes are converted to the corresponding 4-nitroanilines by treatment with hydrogen and hydrogen fluoride in the presence of one or more of certain hydrogenation catalysts, liquid hydrogen fluoride and one or more of certain fluorine-containing acids.
Inventors
- 👤 Paulus P Montijn
- 👤 Albertus J Mulder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:59
CPC Classifications
C; C07; C07C; C07C205/00; C07C205/07; C07C205/11; C07C205/12; C07C209/00; C07C209/30; C07C209/32; C07C209/36; C07C209/365; C07C211/00; C07C211/43; C07C211/44; C07C211/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
A PROCESS FOR PREPARING 4-FLUOROAMILINES, WHICH COMPRISES TREATING AT A TEMPERATURE ABOVE ABOUT 25*C A NITROBEZENE OF THE FORMULA
Claim 2
Dependent Claim
19 words
A PROCESS FOR PREPARING 4-FLUOROAMILINES, WHICH COMPRISES TREATING AT A TEMPERATURE ABOVE ABOUT 25*C A NITROBEZENE OF THE FORMULA
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein W, X, Y and Z each is halogen.
Claim 4
Dependent Claim
15 words
A process according to claim 2 wherein W, X, Y and Z each is chlorine.
Claim 5
Dependent Claim
20 words
A process according to claim 3 wherein the hydrogenation catalyst is platinum dioxide and the fluorine-containing acid is tetrafluoroboric acid.
Claim 6
Dependent Claim
20 words
A process according to claim 4 wherein m, o and p is zero, n is one and Y is chlorine.
Claim 7
Dependent Claim
25 words
A process according to claim 1 wherein the fluorine-containing acid is formed in situ by reaction of the appropriate acidic fluoride and liquid hydrogen fluoride.
Claim 8
Dependent Claim
23 words
A process according to claim 5 wherein the tetrafluoroboric acid is formed in situ by reaction of boron trifluoride and liquid hydrogen fluoride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |