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Keywords:

  • catalysis;
  • coordination modes;
  • delocalization;
  • halogens;
  • metathesis;
  • ruthenium
Thumbnail image of graphical abstract

Coordination, not insertion: New ruthenium benzylidenes with a chelating halogen atom were easily prepared and showed excellent stability and activity as metathesis catalysts (see figure). Structure–activity studies reveal that strength of the ruthenium–halogen interaction can be tuned across a wide range to set up a family of latent to active catalysts.