| 摘要 |
<p>Hydrofluorination of chloro(fluoro)butane of formula (I) C4H5ClxF(5-x) using hydrogen fluoride, is performed in the presence of a catalyst (II) selected from Gp IIIa, IVa, IVb, Va, Vb and Vb metal derivs. In (I), x is 1-5. Also claimed is the prepn. of 1,1,1,3,3-pentafluorobutane (III) by the above process. (II) is Sn or Sb chloride, fluoride or chlorofluoride (pref. antimony pentachloride). 0.001-1 mol. (II) w.r.t. (I) are used. The mol ratio HF to (I) is 4-25. The reaction is effected at 50-150 deg. C and 2-40 bar. (I) is 1,1,3,3-tetrafluoro-1-chlorobutane (Ia); 1,3,3-trifluoro-1,1-dichlorobutane or 1,1,3-trifluoro-1,3-dichlorobutane. (I) is obtd. by reaction of vinylidene chloride with HF.</p> |
