1,4-Butanediol monovinyl ether → 2-[1-[(4-Chlorophenyl)sulfonyl]-5-vinyloxypentyl]-1,4-difluorobenzene

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The 2-[(4-chlorophenyl)sulfonylmethyl]-1,4-difluorobenzene (0.94 g, 3.1 mmol) obtained in Example 5 was dissolved in toluene (30 ml). After addition of 4-vinyloxy-1-butanol (0.51 ml, 4.2 mmol) and cyanomethylenetri-n-butylphosphorane (1.0 g, 4.1 mmol), the resulting mixture was heated under reflux for 3 days under an argon atmosphere. The reaction mixture was allowed to cool down and then concentrated under reduced pressure. The residue thus obtained was purified by silica gel chromatography (hexane:ethyl acetate=10:1) to yield a white solid. The resulting white solid was washed with hexane, whereby the title compound (0.97 g, 78%) was obtained as a white powder.

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