Tetrafluoro-1,2-ethanedisulfenyl

Tetrafluoro-l,2-ethanedisulfenyl dichloride 66 with ammonia easily undergoes a cyclization reaction to give tetra-fluoro-l,3,2-dithiazolidine 56 in high yield (Equation 12) <1995CB429>. Structurally similar bis(sulfonylfluoride) 67 affords tetrafluoro-l,3,2-dithiazolidine ammonium salt 68 in practically the same yield under the same conditions with an excess of ammonia (Equation 13) <1997ZNB359>. 

Tetrafluoro-l -ethanedisulfenyl dichloride reacts with ketones to form a heterocyclic ring and with alkenes to give addition products [6, 7] (equation 5) (Table 1). 

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