Incorporation of redox-inactive cations promotes iron catalyzed aerobic C-H oxidation at mild potentials.

ABSTRACT: The synthesis and characterization of the Schiff base complexes Fe(ii) (2M) and Fe(iii)Cl (3M), where M is a K⁺ or Ba²⁺ ion incorporated into the ligand, are reported. The Fe(iii/ii) redox potentials are positively shifted by 440 mV (2K) and 640 mV (2Ba) compared to Fe(salen) (salen = N,N'-bis(salicylidene)ethylenediamine), and by 70 mV (3K) and 230 mV (3Ba) compared to Fe(Cl)(salen), which is likely due to an electrostatic effect (electric field) from the cation. The catalytic activity of 3M towards the aerobic oxidation of allylic C-H bonds was explored. Prior studies on iron salen complexes modified through conventional electron-donating or withdrawing substituents found that only the most oxidizing der

SUBMITTER: Chantarojsiri T 

PROVIDER: S-EPMC5911827 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature