From fluorodienes

In an analogous way, fluorodienes can be prepared. The substrates for this reaction may be the disodium salts of fluorocarboxylic acids, but unsaturated fluorocarboxylic acids can also be converted to fluorodienes by the sodium salt reaction. e.g. formation of perfluorobuta-1,3-diene (6) from either disodium perfluorohexanedioate or sodium perfluoropcnt-4-enoate. ... 

Chlorofluorocarbene. Schlosser et al. have found that this crown ether is significantly superior to the commonly used ammonium salts for generation of chlorofluorocarbene from dichlorofluoromethane by the two-phase technique. They used potassium hydroxide as base rather than sodium hydroxide, since crown ethers bind potassium ions more selectively than sodium ions. They used the carbene for synthesis of fluorodienes. The method is illustrated for the conversion of methallyl chloride (1) into 2-fluoro-3-methyl-l, 3-butadiene (3-fluoro-isoprene), (4). The conversion of (3) into (4) involves a 1,4-elimination of ICl ... 

Dihydrothiophendioxide 122 adds CIF (generated from HF and A -chlorosuc-cinimide) giving tetrahydrothiophene-1,1-dioxide 123 used as a starting material for the synthesis of 3-chloro-4-fluorothiophene-1,1-dioxide 124. Compound 124 can be used in organic synthesis as fluorodiene. "... 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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