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Treatment of 5-arylimino-4-chloro-5H-1,2,3-dithiazoles with in situ generated (chloro)phenylketene in CH2Cl2 at rt gave azetidin-2-one-4-spiro-5′-(1′,2′,3′-dithiazoles) as major products, which reacted with primary and secondary alkylamines in CH2Cl2 at rt to afford bis(2-oxo-azetidin-4-yl) trisulfides in good to excellent yields.


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