in neat (no solvent) byproducts: HF; leading a stream of F2 (dild. with N2) through FSO2NH2 (35 h, 30 - 40 ml/min), heating to max. 50°C, condensing the product in two traps(cooled with dry ice) arranged behind the reaction vessel; combining the product from the traps, fractionated condensation;

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in dichloromethane all manipulations under N2; condensing FSO2NF2 into CH2Cl2 (-55°C), adding dropwise freshly distd. NHEt2 (-55°C, stirring, 2 h), color changing to yellowish; allowing to warm to room temp. (overnight), removing the solvent, distg. (water bath);