ALIPHATIC CYCLIC AND ACYCLIC PERFLUOR-ALKYL EHTERS AND PROCESS FOR THE PREPARATION THEREOF

摘要

1450467 Perfluoro-alkyl ethers HOECHST AG 6 Feb 1974 [9 Feb 1973] 05488/74 Heading C2C [Also in Division C7] Perfluoroalkyl ethers of general formulae or (II) HC x F 2x O[(CH 2 ) d CH 2 CHRSP11/SP-O] e C x F 2x H where RSP1/SP is C n H 2n+2-(a+b) n is an integer 1-10, a and b are each 0 or 1-4, (a+b)#1, c is 0 or an integer 1-3, x is 2 or 3, e is 2 or 3, RSP11/SP is H or CH 3 and d is 0 or an integer 1-4 are prepared by dissolving a mono or polyfunctional alcohol of formula in a polar aprotic solvent and reacting it with CF 2 = CFCF 3 in the presence of a trialkylamine, or with CF 2 = CF 2 , at - 30‹ to + 100‹ C. Perfluoroalkyl esters of general formulae where RSP1/SP F is C n F 2n+2-(a+b) , (IV) RSP11/SP F is F and d is 0 or an integer 1-4, or RSP11/SP F is CF 3 and d=0 are obtained by dissolving compound I or II in anhydrous HF and electrolysing at - 20‹ to +30‹ C. and 4-7À5 v. The first reaction is preferably performed with at least 0À1 mole of trialkylamine per OH group to be reacted at 20-60‹ C. The electrolysis is advantageously carried out at 0-15‹C. Amongst numerous examples the compounds tris - (hexafluoropropyl) - glycerol ether, trisheptafluoropropyl glycerol ether, sorbitol hexakis - (hexa- or hepta - fluoropropyl)ethers and di - (hexa- or hepta - fluoropropyl)-butyleneglycol ethers are prepared.