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Issue 59, 2014
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Labile alkoxyamines: past, present, and future

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Alkoxyamines – per-alkylated derivatives of hydroxylamine R1R2NO–R3 – can undergo C–ON bond homolysis to release a persistent nitroxyl radical R1R2NO˙ and a transient alkyl radical R3˙. Although they were considered as an oddity when discovered in 1974, their properties have been extensively studied since the seminal work of Solomon, Rizzardo and Cacioli (Chem. Abstr., 102, 221335q), who patented the key role of alkoxyamines in nitroxide-mediated polymerization (NMP) in 1985. This feature article surveys and assesses the various applications of alkoxyamines: in tin-free radical chemistry, e.g., for the elaboration of carbo- or hetero-cycles, for the development of new reactions, for total synthesis of natural products; in polymerization under thermal conditions (NMP) or photochemical conditions (nitroxide-mediated photo-polymerization, NMP2); and in the design of smart materials. In this feature article, we also describe our recent findings concerning the chemical triggering of the C–ON bond homolysis in alkoxyamines, affording the controlled generation of alkyl radicals at room temperature. Based on these results, we describe herein some new opportunities for applications in the field of smart materials, and of course, some possible developments as new initiators for NMP as well as an entirely new field of application: the use of alkoxyamines as theranostic agents. Indeed, each of the radicals released after homolysis can play an appealing role: the nitroxide, through dynamic nuclear polarization (DNP), can be used for imagery purposes (diagnostic properties), while the alkyl radical can be used to induce cellular disorders in abnormal cells (therapeutic activity).

Graphical abstract: Labile alkoxyamines: past, present, and future

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The article was received on 21 Feb 2014, accepted on 01 May 2014 and first published on 02 May 2014

Article type: Feature Article
DOI: 10.1039/C4CC01364F
Citation: Chem. Commun., 2014,50, 7921-7928
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    Labile alkoxyamines: past, present, and future

    G. Audran, P. Brémond and Sylvain. R. A. Marque, Chem. Commun., 2014, 50, 7921
    DOI: 10.1039/C4CC01364F

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