Constructions of monofluorocyclopropanes usually require freons as the starting materials or the reagents. The utilization of freons is nowadays restricted, because freons destruct the ozone layer of the earth. Therefore, it is almost impossible to synthesize monofluorocyclopropanes in these days. We would like to report that the reaction of chloromethyl phenyl sulfide with selectfluor provides chlorofluoromethyl phenyl sulfide. Chlorofluoromethyl phenyl sulfide has been used as the reagent for the constructing of mopnofluorocyclopropanes and has been prepared from dichlorofluoromethane (one of the freons). We also found that the reaction of carbanions derived from cyclopropanes containing a sulfonyl group with N-fluorobenzensulfonimide provided the fluorinated cyclopropanes. The successive desulfonization using magnesium afforded the monofluorocyclopropanes.
