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Perhalogeno disulfenes (dimeric thione-S,S-dioxides) (2 a, b) are singly cleaved by TAS–fluoride forming the intermediate salts 3a and 3b. From both anions a fluoride ion can be abstracted by silicon tetrafluoride and the perhalogenated mesylsulfenes X 3 C — SO 2 — C(X)= SO 2  (4 a) (X = Cl) and (4b) (X = Br) could be obtained, which are stabilized by S-coordinated quinuclidine. Hydrolysis occurs to 4 a, b forming the sulfonium salts 7a, b, which are the structural isomers to the sulfonium salts 5 a, b achieved from direct hydrolysis of 2 a, b in the presence of quinuclidine.

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Darstellung perhalogenierter Mesylsulfene, X 3 C — SO 2  — C(X) = SO 2 , und ihre Stabilisierung durch Chinuclidin / Preparation of Perhalogenated Mesylsulfenes, X 3 C —SO 2 — C(X) = SO 2 , and their Stabilization with Chinuclidin