Methyl fluorosulfate → 4-Cyano-3,5-dichloro-2-methylisothiazolium fluorosulfonate

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Reaction Steps

4-Cyano-3,5-dichloroisothiazole (5.0 g, 0.028 mol) and 4 ml of methyl fluorosulfonate were heated at 80°-90° for 30 min under a nitrogen atmosphere. The resulting solid was washed with ether and benzene to yield 7.5 g (92%) of 4-cyano-3,5-dichloro-2-methyl-isothiazolium fluorosulfonate, mp 160-170. Spectral data (NMR and IR) were consistent with the assigned structure. Analysis-calculated for C5H3Cl2FN2O3S2 : C, 20.50; H, 1.02; Found: C,20.27;H, 1.44.

Provenance & Evidence