Fluorination reaction of alkenes with iodine and HF·pyridine complex (pyr·9HF) was performed under mild conditions in the presence of K2S2O8 or Na2S2O8 as an oxidant. Aliphatic and aromatic alkenes underwent iodofluorination to give the iodofluorinated products with high regioselectivity. The substitution reactions of the iodofluorinated product by nitrogen, sulfur, and oxygen nucleophiles indicated
在K 2 S 2 O 8或Na 2 S 2 O 8氧化剂存在下,烯烃与碘和HF·吡啶络合物(pyr·9HF)的氟化反应在温和条件下进行。脂肪族和芳香族烯烃经过碘氟化反应得到具有高区域选择性的碘氟化产物。氮、硫和氧亲核试剂对碘氟化产物的取代反应表明其进一步用作合成 2-氟烷基取代化合物的构建单元。
Iodofluorination of Alkenes and Alkyne using Electrochemically Generated Iodonium Cation
Iodofluorination reaction of alkenes and alkynes using the iodonium ion electrochemically generated in situ from the iodide anion was carried out. The reaction proceeds at room temperature to provide iodofluorination products regioselectively.
Selective Halofluorination of Alkenes with Tetrabutylphosphonium Dihydrogentrifluoride in Combination with<i>N</i>-Halosuccinimide or 1,3-Dibromo-5,5-dimethylhydantoin
Alkenes and their functionalized derivatives were readily converted to the corresponding halofluorides with tetrabutylphosphonium dihydrogentrifluoride as combined with N-halosuccinimides or 1,3-dibromo-5,5-dimethylhydantoin in highly regio-, stereo-, and chemoselective manners. In particular, alkenes having a oxirane or primary hydroxyl group also underwent halofluorination selectively in good yields
Hydrogenfluoride is a basic fluorinating reagent, but handling it is difficult. For this reason, some modified fluorinating reagents such as HF-pyridine, Et3N-HF, and poly(hydrogenfluoride) complex have been developed. Those reagents, however, still require aqueous work-up procedures which generate hydrogenfluoride. Recently, ionic liquids have received much attention because of the ease in handling