N-[2-(3,3,3-trifluoro-1propen-1-yl)phenylsulfonyl]-N'-methylurea → 2-(3,3,3-Trifluoro-1-propen-1-yl)phenylsulfonyl isocyanate

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Reaction Steps

5.9 g of N-[2-(3,3,3-trifluoro-1-propen-1-yl)phenylsulfonyl]-N'-methylurea are suspended in 100 ml of chlorobenzene. The solution is dried by refluxing it in a water separator. Then 6 g of phosgene are introduced into the reaction mixture over 20 minutes at 120°-130° C. The solvent is removed by evaporation, affording 5.6 g of 2-(3,3,3-trifluoro-1-propen-1-yl)phenylsulfonyl isocyanate as a yellowish oil.

Provenance & Evidence