Pummerer-type reaction was carried out with α-acyl sulfides and phenyliodine(III) bis(trifluoroacetate) (PIFA) instead of α-acyl sulfoxides in the room temperature ionic liquid 1-n-butyl-3-methylimidazolium hexafluorophosphate [bmim][PF6] under mild conditions to give the ene adducts 3 in good yields.
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Hou et al. (2006) studied this question.
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