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US 4,393,257 AGranted
Process for preparing benzotrifluoride and its derivatives
AssigneeDaikin Kogyo Co., Ltd.
InventorsTsuneo Nakagawa, Uji Hiramatsu, Toshihide Honda
Life of this patent
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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.
Claims6
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
Dependencies are inferred from the claim text.