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US 4,400,563 AGranted
Process for preparing perfluoro(lower)alkylbenzenes and their derivatives
AssigneeDaikin Kogyo Co., Ltd.
InventorsYohnosuke Ohsaka, Uji Hiramatsu, Toshihide Honda
Life of this patent
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Abstract
A process for preparing perfluoro(lower)alkylbenzenes and derivatives thereof which comprises contacting a lower alkylbenzene or the corresponding derivative with hydrogen fluoride in the presence of chlorine in the gaseous phase at an elevated temperature to give the corresponding perfluoro(lower)alkylbenzene or its derivative thereof.
Claims8
A process for preparing perfluoro(lower)alkylbenzene derivatives which comprises contacting a lower alkylbenzene compound of the formula:
- ##STR4## wherein R is lower alkyl and 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 presence of chlorine in the absence of a catalyst and in the gaseous phase at an elevated temperature to give the corresponding perfluoro(lower)alkylbenzene compound of the formula:
- ##STR5## wherein R' is perfluoro(lower)alkyl and R.sub.1 ', R.sub.2 ' and R.sub.3 ' are each hydrogen, trifluoromethyl, nitro, cyano or halogen, but 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.
Dependencies are inferred from the claim text.