Cobalt complexes have historically found limited use in the activation of sp3 hybridized carbon-hydrogen bonds. Here, we use cobalt(II) complexes with N,N’-dibenzyl-N,N’-bis(2-pyridylmethyl)-1,2-cyclohexanediamine (bbpc) and N-benzenesulfonyl-N,N’-bis(2-pyridylmethyl)-1,2-cyclohexanediamine (bsbpc) to catalyze the oxidation of benzylic and allylic C-H bonds by iodosobenzene and meta-chloroperbenzoic acid. The bbpc complex is exclusively high-spin whereas the bsbpc displays a spin-crossover. Despite the change in the electronic character of the metal, the product distributions and activities of the C-H activation reactions are similar, with the spin-crossover complex being slightly less active than the high-spin one.

Catalytic activation of sp3 C-H bonds by high-spin and spin-crossover Co(II) complexes

256th National Meeting (2018)

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