Abstract

N‐Sulfinylimmonium tetrafluoroborates (3) are valuable reagents and certainly not mere inorganic curiosities; they are readily accessible by alkylation of N‐sulfinylamines (1). Former syntheses of similar salts were much more involved. The salts (3) are very good cycloaddition partners, and also provide a new entry to aminosulfonium salts of type (4). equation image equation image

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