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Keywords:

  • anthracene;
  • cycloaddition;
  • dimerization;
  • photochemistry;
  • upconversion
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Double up: Photochemical upconversion by MLCT-sensitized triplet–triplet annihilation is demonstrated (MLCT=metal-to-ligand charge transfer). Selective visible excitation of [Ru(dmb)3]2+ (dmb=4,4′-dimethyl-2,2′-bipyridine) in the presence of anthracene efficiently produces the [4+4] cycloaddition product. This transformation traditionally requires ultraviolet light.