Difluorocarbene precusors 2, FSO2CF2COF, FSO2CF2CO2H, FSO2CF2CO2Me and XCF2CO2M react with Kl to give HCF2l 1 in high yields; a smooth reaction of 1 with alkenes or alkynes in the presence of Na2S2O4 gives the difluoromethylated adducts in good yields.
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Pin et al. (1994) studied this question.
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