[CH:1]1[C:6]([NH2:7])=[CH:5][C:4]2[O:8][C:9]([F:12])([F:11])[O:10][C:3]=2[CH:2]=1.Cl.[C:14](Cl)(Cl)=[S:15].ClCCl>O>[N:7]([C:6]1[CH:1]=[CH:2][C:3]2[O:10][C:9]([F:11])([F:12])[O:8][C:4]=2[CH:5]=1)=[C:14]=[S:15]34.6 g of 5-amino-2,2-difluorobenzodioxole were added dropwise to a solution of 90 ml of conc. hydrochloric acid in 350 ml of water. The mixture was stirred for a further 30 minutes and then 27 g of thiophosgene were metered in rapidly. The mixture was stirred at the given temperature for a further 3 hours, the almost colourless suspension was admixed with 150 ml of dichloromethane and the dichloromethane was removed. The crude product was distilled at 45 mbar. 28 g (=89% of theory) were obtained as a colourless to yellowish liquid.
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