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Example 8. Synthesis of cold Fluoromethyltosylate (15)i iiCH2I2 CH2OTos2 FCH2OTos13 14 15 Scheme 3 i: Silver p-toluenesulfonate, MeCN, reflux, 20 h;ii: KF, MeCN, reflux, 1 h.According to Scheme 3 above:(a) Synthesis of methylene ditosylate (14)Commercially available diiodomethane (13) (2.67 g, 10 mmol) was reacted with silver tosylate (6.14 g, 22 mmol), using the method of Emmons and Ferris, to give methylene ditosylate (10) (0.99g) in 28percent yield (Emmons, W.D., et ah, "Metathetical Reactions of Silver Salts in Solution. II. The Synthesis of Alkyl Sulfonates", Journal of the American Chemical Society, 1953; 75:225).