Site-Selective Alkyl Dehydrogenation of a Coordinated Acylphosphine Ligand
摘要:
Regio- and stereoselective alkane dehydrogenation is a difficult challenge in organometallic chemistry. Intermolecular reactions of this type typically produce numerous olefin stereo- and regioisomers. Herein, we report our initial investigations into the intramolecular dehydrogenation of a datively bound alkyl ligand, demonstrating the first example of a site-selective dehydrogenation of an unactivated acyclic alkyl group. The alkyl group is located on an acylphosphine ligand that is coordinated to a Cp*IrCl2 monomer. A mechanistic proposal, guided by the isolation of a dimeric iridium complex and supported by computational results, is also described.
Synthesis and Reactivity of the Anionic Iridium(III) Complex [Cp*Ir(OTf)<sub>3</sub>][Ag{<sup><i>t</i></sup>Bu<sub>2</sub>P(heptanoyl)}]
作者:Sean M. Whittemore、Judith Gallucci、James P. Stambuli
DOI:10.1021/om200639e
日期:2011.10.10
The synthesis of an iridium complex bearing the unusual di-tert-butylheptanoylphosphine ligand is described. In exploring the chemistry of this complex, it was found that the acylphosphine ligand underwent facile transmetalation to silver in the presence of silver triflate. The result was the formation of a novel anionic iridium complex. The X-ray crystalstructure revealed that the anion [Cp*Ir(OTf)3]−
Site-Selective Alkyl Dehydrogenation of a Coordinated Acylphosphine Ligand
作者:Sean M. Whittemore、Ryan J. Yoder、James P. Stambuli
DOI:10.1021/om300471h
日期:2012.9.10
Regio- and stereoselective alkane dehydrogenation is a difficult challenge in organometallic chemistry. Intermolecular reactions of this type typically produce numerous olefin stereo- and regioisomers. Herein, we report our initial investigations into the intramolecular dehydrogenation of a datively bound alkyl ligand, demonstrating the first example of a site-selective dehydrogenation of an unactivated acyclic alkyl group. The alkyl group is located on an acylphosphine ligand that is coordinated to a Cp*IrCl2 monomer. A mechanistic proposal, guided by the isolation of a dimeric iridium complex and supported by computational results, is also described.