| 摘要 |
PURPOSE:To efficiently obtain the subject compounds expectable for use of blowing agent, etc., similar to fluorocarbon in high selectivity and high yield by using trihydrohalogenopropanes as raw material and fluorinating in liquid phase in the presence of HF and specific fluorinating catalyst. CONSTITUTION:Trihydrohalogenopropanes having dihalogenomethylene group expressed by formula I (0<=m<=2) such as 1,1,2,2,3-pentachloropropane or 1,1,1,2- tetrachloro-2-fluoropropane is fluorinated by reacting with HF in the presence of catalyst composed of at least one halide of niobium, tantalum or antimony such as niobium pentachloride, antimony pentachloride or tantalum pentafluoride in liquid phase at 0-200 deg.C in normal pressure or under pressure to afford the aimed compounds expressed by formula II (2<=n<=5) such as 1,1,3-trichloro-2,2- difluoropropane expected of similar use as fluorocarbon such as coolant or detergent. |
