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Keywords:

  • click chemistry;
  • copper;
  • Huisgen cycloaddition;
  • photocontrolled catalysts;
  • photolatent catalysts
Thumbnail image of graphical abstract

As light changes night (yin) into day (yang), irradiation of the click-inactive copper(II) tren ketoprofenate complex triggers an efficient photoinduced electron-transfer process to provide a highly active copper(I) tren click catalyst. In their Communication on page 7137 ff., J.-M. Vincent et al. also show that by simply introducing air into the reaction medium the catalysis can be switched off, and then on again by bubbling argon followed by irradiation.