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Keywords:

  • carbonylation;
  • homogeneous catalysis;
  • insertion;
  • Lewis acids;
  • rhenium
Thumbnail image of graphical abstract

A helping hand: Incorporation of Group 2 Lewis acids into a macrocycle appended to a phosphine ligand attached to a rhenium carbonyl complex promotes otherwise unfavorable transformations of coordinated CO (see scheme; M=Ca, Sr). These Lewis acids form relatively weak M[BOND]O bonds, thereby enabling release of organic products from the metal center.