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Keywords:

  • heterocycles;
  • selenium;
  • Woollins reagent;
  • X-ray analysis
Thumbnail image of graphical abstract

The first of its kind? A simple, twelve-membered C-Se heterocycle (see structure; blue C, yellow Se, black H) was obtained by treatment of secondary amines with Woollins' reagent. The ring formation proceeds through diselenoate intermediates and requires a polar solvent like dichloromethane.