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Issue 12, 2017
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The first palladium(IV) aryldiazenido complex: relevance for C–C coupling

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Overall two-electron oxidative addition of the aryldiazonium cation para-methoxybenzenediazonium (pmbd+) to [(Tp*)PdIIMe2] (Tp* = hydridotris-(3,5-dimethylpyrazolyl)borate) produces the first characterized palladium(IV) aryldiazenido complex, [(Tp*)PdIVMe2(pmbd)] (pmbd = para-methoxybenzenediazenido). Thermolysis in benzene forms a mixture of products that contains [(Tp*)PdIVMe3] and the C–C coupled product, 4,4′-dimethoxybiphenyl. The use of acetone as the thermolysis solvent changes the product distribution towards the formation of anisole. While some involvement of two-electron pathways in the decomposition cannot be ruled out, radicals, through one-electron steps, are involved in the major pathways for decomposition. The involvement of radicals is confirmed by the solvent dependent nature of the product distribution and by observing that the added N-tert-butyl-α-phenylnitrone efficiently traps aryl radicals.

Graphical abstract: The first palladium(iv) aryldiazenido complex: relevance for C–C coupling

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The article was received on 09 Jan 2017, accepted on 23 Feb 2017 and first published on 24 Feb 2017

Article type: Paper
DOI: 10.1039/C7DT00078B
Citation: Dalton Trans., 2017,46, 4004-4008
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    The first palladium(IV) aryldiazenido complex: relevance for C–C coupling

    M. Daryanavard, D. Armstrong, A. J. Lough and U. Fekl, Dalton Trans., 2017, 46, 4004
    DOI: 10.1039/C7DT00078B

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