Substitutive sulfotrioxidation of branched perfluoroolefins
摘要:
We have studied the insertion of SO3 into the C-F bond of perfluoroolefins under conditions of electrophilic catalysis. It was shown that sufficiently high allylic mobility of the fluorine atoms is only preserved when in the allylic triad, in addition to the substituted fluorine; also not less than three fluorine atoms are present in the alpha and gamma positions.
number of perfluoromethacrylic acid derivatives have been prepared by the elimination of alkyl fluoride from substituted alkoxyperfluoroisobutylenes through the action of Lewis acids. Adducts (11a,b) containing a mesomeric carbonium-cation and a tetrafluoroborate-anion were obtained by reacting aminoacetals of bis(trifluoromethyl)ketene with BF3.
Trifluoromethyl compounds of the formulas ##EQU1## are useful as oil repellants. Substituted barbituric acid derivatives thereof of the formula ##EQU2## are useful as central nervous system depressants for animals. Trifluoromethylfluorocarbonylketene and trifluoromethylmalonyl fluoride are prepared by reacting perfluoromethylacryloyl fluoride with a carboxylic acid.