Issue 9, 2023

Aromatic and aliphatic hydrocarbon hydroxylation via a formally NiIV[double bond, length as m-dash]O oxidant

Abstract

The reaction of (NMe4)2[NiII(LPh)(OAc)] (1[OAc], LPh = 2,2′,2′′-nitrilo-tris-(N-phenylacetamide); OAc = acetate) with 3-chloroperoxybenzoic acid (m-CPBA) resulted in the formation of a self-hydroxylated NiIII-phenolate complex, 2, where one of the phenyl groups of LPh underwent hydroxylation. 2 was characterised by UV-Vis, EPR, and XAS spectroscopies and ESI-MS. 2 decayed to yield a previously characterised NiII-phenolate complex, 3. We postulate that self-hydroxylation was mediated by a formally NiIV[double bond, length as m-dash]O oxidant, formed from the reaction of 1[OAc] with m-CPBA, which undergoes electrophilic aromatic substitution to yield 2. This is supported by an analysis of the kinetic and thermodynamic properties of the reaction of 1[OAc] with m-CPBA. Addition of exogenous hydrocarbon substrates intercepted the self-hydroxylation process, producing hydroxylated products, providing further support for the formally NiIV[double bond, length as m-dash]O entity. This study demonstrates that the reaction between NiII salts and m-CPBA can lead to potent metal-based oxidants, in contrast to recent studies demonstrating carboxyl radical is a radical free-chain reaction initiator in NiII/m-CPBA hydrocarbon oxidation catalysis.

Graphical abstract: Aromatic and aliphatic hydrocarbon hydroxylation via a formally NiIV [[double bond, length as m-dash]] O oxidant

Supplementary files

Article information

Article type
Paper
Submitted
08 Dec 2022
Accepted
27 Jan 2023
First published
30 Jan 2023
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2023,52, 2663-2671

Aromatic and aliphatic hydrocarbon hydroxylation via a formally NiIV[double bond, length as m-dash]O oxidant

P. Heim, R. Gericke, G. Spedalotto, M. Lovisari, E. R. Farquhar and A. R. McDonald, Dalton Trans., 2023, 52, 2663 DOI: 10.1039/D2DT03949D

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