Phenoxathiin → 10-Phenyl-10-phenoxathiinium methylsulfate

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A mixture of 20 g of phenoxathiin, 43.1 g of diphenyliodonium methylsulfate, 0.9 g of copper(II) benzoate, and 210 g of chlorobenzene was heated and stirred at 120° C. for 3 hours. The reaction solution was cooled to room temperature and combined with 20 g of diisopropyl ether for crystallization. The solid was dried under reduced pressure, obtaining the target compound, 10-phenyl-10-phenoxathiinium methylsulfate. Amount 24.7 g, yield 63%.

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