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Issue 19, 2018
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Isolable iodosylarene and iodoxyarene adducts of Co and their O-atom transfer and C–H activation reactivity

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Abstract

We report an unusual series of discrete iodosyl- and iodoxyarene adducts of Co. The formation of these adducts was confirmed by a suite of techniques including single crystal X-ray diffraction. The reactivity of these adducts with O-atom acceptors and an H-atom donor has been investigated with particular focus on elucidating mechanistic details. Detailed kinetic analysis allows for discrimination between proposed oxo and adduct mediated mechanisms. In particular, these reactions have been interrogated by competition experiments with isotopically labelled mixtures which shows that all of the studied adducts display a large KIE. These studies suggest different mechanisms may be relevant depending on subtle substituent changes in the adduct complexes. Reactivity data are consistent with the involvement of a transient oxo complex in one case, while the two other systems appear to react with substrates directly as iodosyl- or iodoxyarene adducts. These results support that reactivity typically ascribed to metal-oxo complexes, such as O-atom transfer and C–H activation, can also be mediated by discrete transition metal iodosyl- or iodoxyarene adducts that are frequent intermediates in the generation of oxo complexes. The influence of additional Lewis acids such as Sc3+ on the reactivity of these systems has also been investigated.

Graphical abstract: Isolable iodosylarene and iodoxyarene adducts of Co and their O-atom transfer and C–H activation reactivity

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Publication details

The article was received on 13 Mar 2018, accepted on 19 Apr 2018 and first published on 23 Apr 2018


Article type: Edge Article
DOI: 10.1039/C8SC01167B
Chem. Sci., 2018,9, 4493-4499
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Isolable iodosylarene and iodoxyarene adducts of Co and their O-atom transfer and C–H activation reactivity

    E. A. Hill, M. L. Kelty, A. S. Filatov and J. S. Anderson, Chem. Sci., 2018, 9, 4493
    DOI: 10.1039/C8SC01167B

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