(η6‐2‐Bromo‐1,1′‐biphenyl)tricarbonylchromium

The title compound, [Cr(C₁₂H₉Br)(CO)₃], crystallizes in the triclinic space group with close Br⋯Br separations. These contacts, along with several other factors, influence the (Ph)C—C(o‐BrC₆H₄) dihedral angle of 58.82 (6)°. The typical piano‐stool coordination about the Cr atom is in excellent agreement with the results of density functional theory calculations.     

Reactions of (η6-Arene)tricarbonylchromium Complexes: Hydrogenation,Nitration, and Bromination

In this study, we explore the reactions of coordinated arenes, e.g., hydrogenation, nitration, and bromination, to prepare compounds which are not accessible from conventional organic synthesis. The reaction products formed from reactions with the coordinated and the uncoordinated arenes are compared. The polycyclic aromatic hydrocarbons (PAHs) employed for this study include phenanthrene, methyl- and acetyl-phenanthrene, and benz[a]anthracene (BA), The tricarbonylchromium group demonstrated various characteristics which influence the reactions in this work, such as an electronic effect to deactivate hydrogenation, a steric effect to exhibit, highly positional selective nitration, and a free radical mechanism to direct bromine to attack at the ring coordinated to tricarbonylchromium.     

Oxidation of Tricarbonyl (η1 η2-but-3-en-1-yl)iron(0)and Tricarbonyl (η3-allyl)iron(0) Anion Complexes with Dioxygen

The addition of reactive carbanions to tricarbonyl(η⁴-1,3-diene)iron(0) complexes proceeded at ?78 °C to give putative tricarbonyl(η¹,η²-but-3-en-1-y1)iron(0) anion complexes and at 25 °C to produce postulated tricarbonyl(η³-allyl)iron(O) anion complexes; trapping of reactive intermediates with dioxygen produced γ,δ-unsaturated acids and allylic alcohols, respectively.     

Comparison of （η^6－Fluoroarene）tricarbonylchromium Complexes with Their Chloro－analogs in Radical Aromatic Substitutions

Reactions of fluoroarene-Cr(CO)3 complexes with SmI2 and earbonyl compounds in THF/HMPA at -40～- 60℃ afforded the correspoDdin~ radical aromatic substitution products in high yield. Compared to the corresponding chloroarene-Cr(CO)3 complexes, fluoroarene-Cr(CO)3 complexes showed a higher efficiency and slightly lower regioselectivity.