[F:1][C:2]([S:5][C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][C:7]=1[C:12]#[C:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)([F:4])[F:3].[F:20][C:21]([F:27])([F:26])[S:22]([OH:25])(=[O:24])=[O:23].CCOCC>C(Cl)Cl.C(#N)C>[F:20][C:21]([F:27])([F:26])[S:22]([O-:25])(=[O:24])=[O:23].[F:1][C:2]([F:4])([F:3])[S+:5]1[C:13]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)=[CH:12][C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][C:6]1=2A solution of (trifluoromethyl)-(2-(2-phenylethynyl)phenyl)sulfide (1.5 g, 5.4 mmol) prepared in Example 2 in 10 ml of methylene chloride was charged into a 50-ml eggplant flask equipped with a stirrer, and cooled to −80° C. Then, trifluoromethanesulfonic acid (1.62 g, 10.8 mmol) was added dropwise to the solution, and the solution was gradually heated to room temperature, and stirred overnight. After completion of the reaction, a solvent was removed, ether was added to the obtained residue to cause solidification, and the solidified product was filtered and washed with ether. The obtained crude product was dissolved in acetonitrile, and ether was added to the solution to cause crystallization to obtain target S-(trifluoromethyl)-2-phenylbenzo[b]thiophenium trifluoromethanesulfonate (1.8 g, 80%).
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