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Issue 19, 2018
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Alkene-alkyl interconversion: an experimental and computational study of the olefin insertion and β-hydride elimination processes

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Abstract

The preparation and characterization of various alkyl, allyl or alkene Rh(III) and Ir(III) complexes as well as studies on the intramolecular reactions leading to transformation of one into another are reported. The silyl-hydrido-Rh(III) complex {Rh(H)[SiMe(o-C6H4SMe)2](PPh3)}[BArF4], with a vacant coordination site, reacts with 1,5-cyclooctadiene (cod) leading to olefin insertion into the Rh–H bond and rearrangement to yield the 16e cyclooctenyl-Rh(III) complex {Rh(η3-cyclooctenyl)[SiMe(o-C6H4SMe)2]}[BArF4] (1). This compound can be also synthesized by reaction of the 18e chloride precursor {Rh(η3-cyclooctenyl)[SiMe(o-C6H4SMe)2]Cl} with NaBArF4. The reaction of the thioether-silane SiMeH(o-C6H4SMe)2 with [Rh(nbd)Cl]2 (nbd = norbornadiene) leads to {Rh(σ-ntyl)[SiMe(o-C6H4SMe)2]Cl} (ntyl = nortricyclyl) (2). The abstraction of chloride from this neutral 16e ntyl-Rh(III) complex with NaBArF4 results in the unusual isomerization of σ-nortricyclyl into σ,π-norbornenyl forming the 16e and cationic {Rh(σ,π-nbyl)[SiMe(o-C6H4SMe)2][BArF4] (nbyl = norbornenyl)} compound 3. Coordinatively saturated {Ir(η3-cyclooctenyl)[SiMe(o-C6H4SMe)2]Cl} (4) has been synthesized by the reaction of [Ir(cod)Cl]2 with SiMeH(o-C6H4SMe)2. The reaction of 4 with NaBArF4 led to the formation of the unsaturated and cationic Ir(III) compound {Ir(η3-cyclooctenyl)[SiMe(o-C6H4SMe)2]}[BArF4] (5). Compound 5 shows low stability in solution and undergoes successive β-hydride elimination and olefin insertion steps, which were elucidated by DFT calculations, to form 18e {Ir(H)[SiMe(o-C6H4SMe)2](η4-cod)}[BArF4] (6).

Graphical abstract: Alkene-alkyl interconversion: an experimental and computational study of the olefin insertion and β-hydride elimination processes

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Publication details

The article was received on 02 Feb 2018, accepted on 26 Apr 2018 and first published on 27 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00448J
Citation: Dalton Trans., 2018,47, 6808-6818
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    Alkene-alkyl interconversion: an experimental and computational study of the olefin insertion and β-hydride elimination processes

    S. Azpeitia, U. Prieto, E. San Sebastián, A. Rodríguez-Diéguez, M. A. Garralda and M. A. Huertos, Dalton Trans., 2018, 47, 6808
    DOI: 10.1039/C8DT00448J

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