Sodium Hydroxide → Triphenylsulfonium 2,2-difluoro-3-methacryloyloxypentanoate

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A 1-L glass flask equipped with a dropping funnel was charged with 108 g (0.486 mol) of 1-hydroxycarbonyl-1,1-difluoro-2-butyl methacrylate and 108 g of chloroform, which were stirred and cooled at 0° C. Then 224 g (0.560 mol/1.15 equivalent) of a 10 wt % sodium hydroxide aqueous solution was added dropwise to the solution, which was stirred at room temperature for 1 hour. Then 169 g (0.492 mol/1.01 equivalent) of triphenylsulfonium bromide in 432 g of chloroform was added to the solution, which was stirred at room temperature for 1 hour. After the completion of reaction was confirmed by 1H-NMR spectroscopy, an organic layer was separated from the reaction liquid and washed 3 times with 300 g of water. The organic layer was concentrated in vacuum, obtaining 238 g (yield 81%, purity 80%) of triphenylsulfonium 2,2-difluoro-3-methacryloyloxypentanoate, designated Monomer Z-1, having the following structure.

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