[F:1][CH2:2][C:3]1[CH:4]=[C:5]([OH:11])[CH:6]=[C:7]([CH2:9][F:10])[CH:8]=1.[OH-].[Na+].[F:14][C:15]([F:22])([F:21])[C:16]([F:20])=[C:17]([F:19])[F:18]>CC(C)=O.O>[F:18][C:17]([O:11][C:5]1[CH:4]=[C:3]([CH2:2][F:1])[CH:8]=[C:7]([CH2:9][F:10])[CH:6]=1)([F:19])[CH:16]([F:20])[C:15]([F:22])([F:21])[F:14]490 g of 3,5-bis-fluoromethyl-phenol were placed in 1000 ml of acetone together with 50 g of 50% by weight aqueous sodium hydroxide solution, and hexafluoropropene was introduced at 25° C. up to the saturation point. The batch was then diluted with 11 of water and the organic phase was separated off, dried and distilled to give 673 g of 3,5-bis-fluoromethyl-phenyl 1,1,2,3,3,3-hexafluoropropyl ether with a boiling point of 65° to 70° C. at 22 mbar and a refractive index nD2 of 1.3560.
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