Univalent Transition Metal Complexes of Arenes Stabilized by a Bulky Terphenyl Ligand: Differences in the Stability of Cr(I), Mn(I), Or Fe(I) Complexes

Two univalent transition metal complexes, (µ-6:6-C7H8){MnAr*-3,5-Pri2}2 ( 1) and (6-C6H6)FeAr*-3,5-Pri2 ( 2) (Ar*-3,5-Pri2 = C6H-2,6-(C6H2-2,4,6-Pri3)2-3,5-Pri2), that have 6 arene coordination were synthesized by reduction of the corresponding metal halides. The complexes are thermally stable in contrast to the corresponding Cr(I) complexes of benzene or toluene which decompose at room temperature