Synthesis of fluoroalkyl-δ-lactones from polyfluoroalkyl iodides and 5-hexenoic acids

The polyfluoroalkyl-lactonization of 5-hexenoic acids with the polyfluoroalkyl iodides initiated by sodium dithionite was carried out in aqueous acetonitrile, providing an efficient method for the synthesis of fluorine-containing δ-valerolactones. Formation of RfCH2CHCH(CH2)2COOH appeared to be unexpected minor product in sulfinatodehalogenation reagents.

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