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Tandem reaction between acyl isoselenocyanates, generated from acyl chlorides and KSeCN, and benzene‐1,2‐diamine in acetone at room temperature, gave 1,3,5‐triazepineselone derivatives in moderate to good yields.

A simple one-pot synthesis of highly functionalized 1,2,4-diselenazolidines is described. Treatment of an acyl chloride with potassium selenocyanate in acetone gave an acyl isoselenocyanate and propane-2-selone, which both reacted with benzylamine or its derivatives to give the required products.

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