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IrI(η4-diene) precatalyst activation by strong bases: formation of an anionic IrIII tetrahydride

Authors: Paven Kisten; Eric Manoury; Agustí Lledós; Adrian C. Whitwood; Jason M. Lynam; John M. Slattery; Simon B. Duckett; +1 Authors

IrI(η4-diene) precatalyst activation by strong bases: formation of an anionic IrIII tetrahydride

Abstract

International audience; The reaction between [IrCl(COD)]2 and dppe in a 1:2 ratio was investigated in detail under three different conditions. [IrCl(COD)(dppe)], 1, is formed at room temperature in the absence of base. In the presence of a strong base at room temperarture, hydride complexes that retain the carbocyclic ligand in the coordination sphere are generated. In isopropanol, 1 is converted into [IrH(1,2,5,6-η2:η2-COD)(dppe)] (2) on addition of KOtBu, with k12 = (1.11±0.02)·10-4 s-1, followed by reversible isomerisation to [IrH(1-κ-4,5,6-η3-C8H12)(dppe)] (3) with k23 = (3.4±0.2)·10-4 s-1 and k32 = (1.1±0.3)·10-5 s-1 to yield an equilibrium 5:95 mixture of 2 and 3. However, when no hydride source is present in the strong base (KOtBu in benzene or toluene), the COD ligand in 1 is deprotonated, followed by β-H elimination of an IrI-C8H11 intermediate, which leads to complex [IrH(1-κ-4,5,6-η3-C8H10)(dppe)] (4) selectively. This is followed by its reversible isomerisation to 5, which features a different relative orientation of the same ligands (k45 = (3.92±0.11)·10-4 s-1; k54 = (1.39±0.12)·10-4 s-1 in C6D6), to yield an equilibrated 32:68 mixture of 4 and 5. DFT calculations assisted in the full rationalization of the selectivity and mechanism of the reactions, yielding thermodynamic (equilibrium) and kinetic (isomerization barriers) parameters in excellent agreement with the experimental values. Finally, in the presence of KOtBu and isopropanol at 80 °C, 1 is tranformed selectively to K[IrH4(dppe)] (6), a salt of an anionic tetrahydride complex of IrIII. This product is also selectively generated from 2, 3, 4 and 5 and H2 at room temperature, but only when a strong base is present. These results provide an insight into the catalytic action of [IrCl(LL)(COD)] complexes in the hydrogenation of polar substrates in the presence of a base.

Country
France
Keywords

Inorganic Chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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Average
Funded by
EC| CCIMC
Project
CCIMC
Coordination chemistry inspires molecular catalysis
  • Funder: European Commission (EC)
  • Project Code: 860322
  • Funding stream: H2020 | MSCA-ITN-EJD
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