Abstract
The title compound, [Co(C10H15)(C2H4)2], was prepared by Na/Hg reduction of [Co2(C10H15)2(μ-Cl)2] in THF under an ethyl-ene atmosphere and crystallized from pentane at 193 K. The Co-C(olefin) bonds have an average length of 2.022 (2) Å, while the Co-C(penta-dien-yl) bonds average 2.103 (19) Å. The olefin C=C bonds are 1.410 (1) Å. The dihedral angle between the planes defined by the cyclo-penta-dienyl ligand and the two olefin ligands is 0.25 (12)°. In the crystal, mol-ecules are linked into chains by C-H⋯π inter-actions.
Highlights
2.022 (2) Å, while the Co—C(pentadienyl) bonds average 2.103 (19) Å
A weak C—H interaction is observed between one of the methyl groups and the Cp* ring edge of the adjacent molecule related by a 21 screw axis
The shortest contact occurs between the C6—H6C of the methyl group and the C1 atom of the Cp* ring [H6C C1i 2.79, C6 C1i
Summary
The title compound, Cp*Co(CH2CH2) (Cp* = pentamethylcyclopentadienyl), was first reported in 1981 by Spencer and coworkers (Beevor et al, 1981) in their quest to find a more thermally labile analogue of the related Cp*Co(dicarbonyl) complex. Since this first report, it and other olefin complexes of cobalt with Cp* or Cp (Cp = cyclopentadienyl) have become important precursors for the generation of Cp0 CoL The utility of the Cp*Co(CH2CH2) complex in organometallic synthesis has been explored extensively. Examples include the preparation of high-oxidation state CoV complexes (Brookhart et al, 2000) and the preparation of Cp*Co(5-pentadienyl)+ complexes (Witherell et al, 2008; Ylijoki et al, 2009, 2015)
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