PURPOSE: To efficiently obtain a dibromofluoroalkane in good yield at a low cost by brominating a monobromomonofluoroalkane used as 2 starting substance.
CONSTITUTION: A monobromomonofluoroalkane of formula I (R is H or 1-10C alkyl) is made to react with bromine to provide the objective dibromofluoroalkane of formula II. The reaction is preferably carried out at 500-700°C. Bromofluoromethane, 1-bromo-1-fluoroethane, 1-bromo-1-fluorodecane, etc., are cited as the monobromomonofluoroalkane which is a starting substance. The bromine is used in an amount of preferably 1.0-2.0mol based on 1mol bromofluoroalkane. Since gaseous reaction is carried out, this method can be performed by using a tubular reactor according to a flow method. The raw material mixed gas is passed through the 100-1000ml/min flow velocity and made to react. When a heat-resistant tubular reactor such tubular reactor such as Pyrex(R) glass or quartz is used, side reaction can be suppressed to improve the yield of the objective compound.
SOEI TANEOMI
AMANO TOSHIHIKO
YAMAMOTO SADAHIRO
SHIMOKAWA KAZUHIRO
