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Keywords:

  • carbenes;
  • carbocations;
  • gold;
  • homogeneous catalysis;
  • reactive intermediates
Thumbnail image of graphical abstract

What is the nature of the gold–carbon bond—double, single? The structure of a crucial intermediate of many gold-catalyzed reactions has become a matter of debate. A current study demonstrates that the carbocationic form determines the outcome of many cycloisomerizations.