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A series of ferrocenyl ketones were obtained via the Friedel–Crafts acylation with mixed anhydrides using ferrocene as a nucleophilic agent or ferrocene carboxylic acid as a precursor of the electrophilic species. The ketones obtained thereby undergo smooth thionation (tetrahydrofuran, 65°C) with Lawesson's reagent. The ferrocenyl thioketones react with diphenyldiazomethane via N2 elimination to afford the hitherto unknown ferrocenyl-substituted thiiranes.
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