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Keywords:

  • C[BOND]H activation;
  • lanthanides;
  • reduction;
  • samarium;
  • steric effects
Thumbnail image of graphical abstract

Spontaneous reduction of samarium(III) to samarium(II) is observed upon addition of bulky cyclic triaminals to [Sm(AlMe4)3] (see scheme). The methyl groups of the organometallic precursor act as reductant, and C[BOND]H activation is found as a side reaction. This reaction is the first base-induced reduction of a lanthanide(III) complex to lanthanide(II) in the complete absence of stabilizing cyclopentadienyl systems.