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ester diphenyl-4-methacroyloxy-phenylsulfonium salt was observed by $^{1}$H-NMR (see FIG. 9): 

$^{1}$H-NMR (chloroform-d3, reference: tetramethylsilane): (ppm) 2.05 (s, 3H), 4.98 (t, 2H), 7.38-7.78 (m, 15H), 7.91 (d, 2H), 8.12 (d, 2H), 

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## Adamantane-1-carboxylic acid-2,2-difluoro-2-sulfo-ethyl Ester Diphenyl-4-hydroxyphenylsulfonium Salt Synthesis 

About 10 g of the diphenyl-4-hydroxyphenylsulfonium trifluoromethanesulfonate salt manufactured in the synthesis example 3 and about 9.7 g of an adamantane-1-carboxylic acid-2,2-difluoro-2-sulfo-ethyl ester sodium salt were dis› solved in about 100 ml of an MC and about 100 ml of water, and a synthesis reaction (see Equation 11 below) was per› formed while strongly stirring for three hours. In this instance, a process of the synthesis reaction was observed by $^{19}$F NMR using a small amount of an extracted organic phase. The organic phase was extracted when the synthesis reaction was terminated, and washed using the MC of a soluble solvent and hexane of a sparingly soluble solvent. Next, the solvents were removed, and drying under a reduced pressure was performed to obtain about 11.47 g (a yield: about 81.7%) of an adamantane-1-carboxy lie acid-2,2-difluoro-2-sulfo-ethy 1 ester diphenyl-4-hydroxyphenylsulfonium salt, and a struc› ture of the adamantane-1-carboxylic acid-2,2-difluoro-2- sulfo-ethyl ester diphenyl-4-hydroxyphenylsulfonium salt was observed by $^{1}$H-NMR (see FIG. 10): 

## Synthesis Example 11 

$^{1}$H-NMR (chloroform-d3, reference: tetramethylsilane): (ppm) 1.63-2.05 (m, 15H), 4.78 (m, 2H), 7.05 (d, 2H), 7.38 (d, 2H), 7.55-7.78 (m, !OH), and 

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## Adamantane-1-carboxylic Acid-2,2-difluoro-2-sulfo-ethyl Ester Dipheny 1-4-methacroy loxy-pheny lsulfonium Salt Synthesis 

About 11.47 g of the adamantane-1-carboxylic acid-2,2- difluoro-2-sulfo-ethyl ester diphenyl-4-hydroxyphenylsulfo› nium salt, about 1.95 ml of methacryloyl chloride, and about 25.5 mg of 4-methoxyphenol (MEHQ) were mixed and stirred in about 150 ml of an MC, about 5 ml of diisopropy› lethylamine (DIPEA) was gradually dropped using a drop› ping funnel under an ice bath, and a synthesis reaction (see Equation 12 below) was performed while stirring for about three hours at room temperature. In this instance, 4-dimethy› laminopyridine (DMAP) was used as a reaction catalyst, and a process of the synthesis reaction was observed by $^{19}$F NMR using a small amount of an extracted organic phase. The organic phase was extracted when the synthesis reaction was terminated, and washed using IN HCl, distilled water, a satu› rated sodium bicarbonate aqueous solution, and distilled water in the stated order (three times). 

Next, a solvent was removed, and washing with the MC of a soluble solvent and hexane of a sparingly soluble solvent was preformed. Next, the solvents were removed, and drying under a reduced pressure was performed to obtain about 10.8 g (a yield: about 85%) of an adamantane-1-carboxylic acid- 

## Synthesis Example 12 

