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The reactions of acylsulfonium salts, obtained from β-(ethylsulfanyl)propionyl fluoride and (ethylsulfanyl)acetyl fluoride, with various unsaturated hydrocarbons proceed through the formation of six- and five-membered cyclic sulfonium salts, respectively. Succeeding cleavage of sulfonium salts by bases affords the corresponding sulfur containing unsaturated ketones.
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