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Keywords:

  • alkyl halides;
  • cross-coupling;
  • Grignard reagents;
  • iron
Thumbnail image of graphical abstract

A striking reversal of the usual reactivity pattern of aryl Grignard reagents is observed for reactions in the presence of catalytic amounts of the “bare” ferrate complex [Li(tmeda)]2[Fe(C2H4)4] (1). Highly reduced iron–magnesium clusters may play a decisive role in the exceptionally facile and chemoselective cross-coupling reaction with alkyl halides (see scheme).