US4393257A
Expired / Lapsed
US
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Process for preparing benzotrifluoride and its derivatives
Assignee: Daikin Industries Ltd
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Filing: 1979-06-20
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Granted: 1983-07-12
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Expires: 1999-06-20
Abstract
Abstract A process for preparing benzotrifluoride or derivatives thereof by contacting benzotrichloride or the corresponding derivatives with hydrogen fluoride in a gaseous phase in the absence of any catalyst, the contact being carried out in the presence of chlorine at an elevated temperature so as to accelerate the reaction rate.
Inventors
- 👤 Tsuneo Nakagawa
- 👤 Uji Hiramatsu
- 👤 Toshihide Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:35
CPC Classifications
C; C07; C07B; C07B39/00; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206; C07C201/00; C07C201/06; C07C201/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A process for preparing benzotrifluoride derivatives which comprises contacting a benzotrichloride compound of the formula: wherein R 1 , R 2 and R 3 are each hydrogen, trichloromethyl, nitro, cyano or halogen but wherein all of R 1 , R 2 and R 3 are not hydrogen at the same time and when one of R 1 , R 2 and R 3 is nitro, each of the other two is not nitro, with hydrogen fluoride in the absence of any catalyst in the gaseous phase and in the
Claim 2
Dependent Claim
89 words
A process for preparing benzotrifluoride derivatives which comprises contacting a benzotrichloride compound of the formula: wherein R 1 , R 2 and R 3 are each hydrogen, trichloromethyl, nitro, cyano or halogen but wherein all of R 1 , R 2 and R 3 are not hydrogen at the same time and when one of R 1 , R 2 and R 3 is nitro, each of the other two is not nitro, with hydrogen fluoride in the absence of any catalyst in the gaseous phase and in the
Claim 3
Dependent Claim
26 words
The process according to claim 1, wherein the hydrogen fluoride is used in a molar ratio of about 3 to 15 with respect to the benzotrichloride
Claim 4
Dependent Claim
25 words
The process according to claim 1, wherein the chlorine is used in a molar ratio of not more than about 0.3 with respect to the
Claim 5
Dependent Claim
13 words
The process according to claim 1, wherein the contact is effected at a
Claim 6
Dependent Claim
13 words
The process according to claim 1, wherein the contact is effected for a
Claim 7
Dependent Claim
21 words
The process according to claim 1, wherein R 1 , R 2 and R 3 are each hydrogen, trichloromethyl or halogen.
References Cited (Backward Citations)
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US3755477A
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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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |