Dr. Veliks et.al. have published a synthetic methodology of synthesis of a range of monofluoro-cyclopropane derivatives in the journal “Organic & Biomolecular Chemistry” (IF=3.490, 2018). Authors demonstrated Johnson–Corey–Chaykovsky fluorocyclopropanation of double activated alkenes utilizing S-monofluoromethyl-S-phenyl-2,3,4,5-tetramethylphenylsulfonium tetrafluoroborate: