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Keywords:

  • allyl ligands;
  • cyclobutene;
  • palladium;
  • reaction mechanisms;
  • structure determination
Thumbnail image of graphical abstract

Caught in the act: A series of unique η1-allyl palladium complexes of four-membered cyclic systems bearing β-hydrogens were prepared (see structure). Their unusual structure, reactivity, and unprecedented propensity for undergoing pericyclic reactions were uncovered.