# US 4,393,257 A · Process for preparing benzotrifluoride and its derivatives

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- Number: US 4,393,257 A
- Document ID: US4393257A
- Status: Granted
- Kind: A
- Application number: 06/050,211
- Filed: 1979-06-20
- Granted: 1983-07-12
- Earliest claimed: 1976-12-27
- Assignees: Daikin Kogyo Co., Ltd.
- Inventors: Tsuneo Nakagawa; Uji Hiramatsu; Toshihide Honda
- Web page: https://patentgrep.com/patent/US4393257A

## CPC

- C07B 39/00: Halogenation
- C07C 17/206: {the other compound being HX}
- C07C 201/12: by reactions not involving the formation of nitro groups
- C07B: GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR (preparation of carboxylic acid esters by telomerisation C07C67/47; telomerisation C08F)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## 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.

## Claims

### Claim 1

A process for preparing benzotrifluoride derivatives which comprises contacting a benzotrichloride compound of the formula:
wherein R.sub.1, R.sub.2 and R.sub.3 are each hydrogen, trichloromethyl, nitro, cyano or halogen but wherein all of R.sub.1, R.sub.2 and R.sub.3 are not hydrogen at the same time and when one of R.sub.1, R.sub.2 and R.sub.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 (depends on 1)

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 3 (depends on 1)

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 4 (depends on 1)

The process according to claim 1, wherein the contact is effected at a

### Claim 5 (depends on 1)

The process according to claim 1, wherein the contact is effected for a

### Claim 6 (depends on 1)

The process according to claim 1, wherein R.sub.1, R.sub.2 and R.sub.3 are each hydrogen, trichloromethyl or halogen.