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Two perfluorinated alkyl peroxides reported in a 2019 study resisted impact and friction under the authors’ tests—an unexpected result for compounds containing an oxygen–oxygen peroxide bond. The finding applies only to the two compounds studied, not to peroxides generally, and it is not a safety endorsement.
Which compounds did the study examine?
Jan H. Nissen and colleagues reported the synthesis and solid-state structures of bis(nonafluoro-tert-butyl) peroxide and bis(undecafluoro-2-methyl-2-butyl) peroxide in a 2019 paper in Angewandte Chemie International Edition. The study’s abstract is available in the PubMed record; the research group’s publication listing is on the Freie Universität Berlin site.
The researchers prepared the peroxides from the corresponding hypofluorites and fluorinated silver wool. Chemistry World reported that this route avoided chlorine trifluoride, which it described as corrosive, poisonous, and dangerously reactive. That comparison concerns one aspect of the synthesis; it does not establish that the alternative route is safe overall.
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What made their structures unusual?
In the reported solid-state structures, the COOC dihedral angle was 180°, and the O–O bonds were elongated. The authors attributed these structural features to the bulky perfluorinated alkyl groups attached to the peroxide unit. These are structural observations about the two compounds, not evidence that other peroxides share the same geometry or behavior.
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How stable were they in the reported tests?
Nissen and colleagues reported that the two perfluorinated alkyl peroxides were insensitive to impact above 40 J and to friction above 360 N. Those figures are the authors’ reported test thresholds for the studied materials; they should not be read as universal safety limits or as evidence about mixtures, larger-scale quantities, or other handling conditions.
The result is notable because peroxide compounds are often associated with sensitivity and decomposition hazards. But a specific sensitivity finding does not make these substances harmless: their oxidizing behavior and reactions with other substances remain important. Chemistry World’s 2019 account also cautioned about explosion potential when they are mixed with other substances. The paper’s title, “No Fear of Perfluorinated Peroxides,” is not handling advice.
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What chemical resistance and reactivity did the paper report?
The abstract says the compounds resisted mineral acids HX, where X was F, Cl, or Br, and elemental halogens X2. It also separately reports oxidation of ferrocene by bis(nonafluoro-tert-butyl) peroxide. Resistance to those specified reagents does not mean that the peroxides are chemically inert in every setting: the ferrocene reaction itself demonstrates that one can act as an oxidant.
Does this stability make them useful or safe to handle?
The authors suggested a possible role for these strong oxidants as oxidation-resistant solvents in reactions involving similarly resistant compounds, as reported by Chemistry World on 31 January 2019. That is a proposed possibility, not an established application demonstrated by the cited account.
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The evidence supports a narrow conclusion: these two compounds showed unusual resistance to specified impact and friction tests, along with resistance to certain acids and halogens. It does not support extrapolating that behavior to other peroxides, mixtures, scale-up, or unrestricted handling. Their specialist synthesis and the reported warning about mixing make the stability result a chemical finding, not practical guidance for experimentation.
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