[H-].[Na+].[I-].[CH3:4][S+](C)(C)=O.[F:9][C:10]1[CH:15]=[CH:14][C:13]([C:16]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][C:19]=2[Cl:24])=[O:17])=[CH:12][CH:11]=1.O>CS(C)=O>[Cl:24][C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][C:18]=1[C:16]1([C:13]2[CH:12]=[CH:11][C:10]([F:9])=[CH:15][CH:14]=2)[O:17][CH2:4]1
A solution of dimethyl oxosulphonium methylide was prepared under nitrogen from sodium hydride (0.03 mol) and powdered trimethyl oxosulphonium iodide (0.03 mol) in dry dimethylsulphoxide (DMSO; 30 ml). A solution of o-chlorophenyl p-fluorophenyl ketone (0.025 mol) in DMSO (10 ml) was added dropwise at room temperature. The solution was then heated at 50° for 1.5 hours, cooled to room temperature and poured into water. The solution was extracted with diethyl ether (100 ml), washed with water (3×100 ml), and dried over anhydrous sodium sulphate. Removal of the solvent gave 1-o-chlorophenyl-1-p-fluorophenyl ethylene oxide (90%) as a colourless liquid.
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