Of hydrogen fluonde

Electrochemical oxidation of alkyl aryl ethers results m oxidative dealkylation and coupling of the intermediate radicals ElectrooxidaUon m the presence of hydrogen fluonde salt leads to fluonnated dienones [66] (equation 58)... 

Trifluoromethyl groups are very resistant to hydrolysis, unless they are allylic or benzylic, or vicinal to a carbon linked to hydrogen. In the last case, elimination of hydrogen fluonde leads to the formation of a difluoromethylene group which is key to additional reactions... 

Hydrolysis of A-substituted tnfluoromethyl fluoroformamides leads to A-sub-sdtuted trifluoromethylamines by loss of hydrogen fluonde and carbon dioxide [55] (equation 55). 

Preferential elimination of hydrogen fluonde from vicinal halofluoro compounds occurs also in the cyclohexane series [55 56, 57], acenaphthene series [55], and benzodihydrofuran series [59 60] Here, the strength of the base and the stereochemistry play important roles... 

By varying the temperature and the ratio of hydrogen fluonde to tetrachloroethene, the ratio of chloropentafluoroethane to dichlorotetrafluoroethanes can be varied at will The ratio of 1,2-dichlorotetrafluoroethane to 1,1-dichlorotetra-fluorocthane depends upon the temperature of the catalyst, higher temperatures favoring the latter, with yields that can vary from 10 to 50% depending upon operating condidons. 

The addition of hydrogen fluonde to an aromatic isocyanide dichlonde provides a route to the respective aryl-N tnfluoromethyl amine [34] (equation 24)... 

Preferential elimination of hydrogen fluonde occurs also in highly fluorinated lH -chlorodecafluorocyclohexanes and m 1H,1,2-dichlorononafluorocyclahex-anes [57] It takes place predominantly but not exclusively only m those isomers where hydrogen and fluorine are m antipenplanar conformation When hydrogen and fluorine are in synplanar positions, only hydrogen chlonde is eliminated on treatment with 18 N potassium hydroxide at room temperature for 14 h [57] (equation 28)... 

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