Alkylation of MnBr2with the mesityl (2,4,6-trimethylphenyl) reagent Mg(C6H2Me3)2(THF)2in the presence of trimethylphosphine followed by reaction with 1 equiv of oxygen yields dark red crystals of Mn-(C6H2Me3)Br2(PMe3)2, which is the first isolated example of a σr-organomanganese(III) complex. This high-spin (μ = μB)complex adopts a distorted trigonal-bipyramidal structure of approximate C2vsymmetry with the phosphine ligands occupying the axial sites. The metal-ligand distances are consistent with a trivalent oxidation state, while the orientation of the mesityl ring in the equatorial plane and the interligand angles can be rationalized on steric grounds.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry