Chengbao Ni

Reaction of a Sterically Encumbered Iron(I) Aryl/arene with Organoazides: Formation of an Iron(v) Bis(imide)

Reaction of 3,5-Pr(i)2Ar*Fe(eta6-C6H6)(3,5-Pr(i)2Ar* = C6H1-2,6-(C6H2)-2,4,6-Pr(i)3)(2)-3,5-Pr(i)2) with (N3C6H3)-2,6-Mes2 (Mes = (C6H2)-2,4,6-Me3) afforded the dimeric iron(II) amido/aryl complex {CH2C6H(2)-2(C6H3)-2-N(H)FeAr*-3,5-Pr(i)2)-3,5-Me2}2 (1) which arises via methyl hydrogen abstraction by nitrogen and dimerization of the radical via C-C bond formation; in contrast, reaction of 3,5-Pr(i)2Ar*Fe(eta6)-C6H6) with N3(1-Ad) (1-Ad = 1-adamantanyl) gave the iron(V) bis(imido) complex 3,5-Pr(i)2Ar*Fe{N(1-Ad)}2 (2).

Transition Metal Complexes Stabilized by Bulky Terphenyl Ligands: Application to Metal–Metal Bonded Compounds

A wide variety of monodentate, sterically encumbering ligands have been used to stabilize low coordination numbers in both main group and transition element compounds [1]. In recent years, the very crowded m-terphenyls have emerged as a particularly effective class of bulky ligand for the stabilization of numerous main group element compounds with unusual bonding and electron configurations [2, 3]. These include, for example, the first compounds with formal triple bonds between group 13 [4, 5] and group 14 metals [6, 7], as well as a stable crystalline heavier main group radical species [8]. In contrast, transition metal terphenyl derivatives have received less attention and most of the work has been performed within the last 5 years. This account focuses on these recently discovered transition metal species.

An Arene-Stabilized Cobalt(I) Aryl: Reactions with CO and NO

The half-sandwich cobalt(I) complex (eta (6)-C 7H 8)CoAr*-3,5- ( i )Pr 2 (Ar*-3,5- ( i )Pr 2 = -C 6H-2,6-(C 6H 2-2,4,6- ( i )Pr 3) 2-3,5- ( i )Pr 2) was synthesized by reduction of [3,5- ( i )Pr 2Ar*Co(mu-Cl)] 2 in toluene. It reacts with CO or NO to afford the unusual complexes [3,5- ( i )Pr 2Ar*C(O)Co(CO)] or [3,5- ( i )Pr 2Ar*N(NO)OCo(NO) 2].