Oxoammonium salts are catalysing efficient and selective halogenation of olefins, alkynes and aromatics

Weijin Wang, Xinyao Li, Xiaoxue Yang, Lingsheng Ai, Zhiwen Gong, Ning Jiao and Song Song ()
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Weijin Wang: Peking University
Xinyao Li: Peking University
Xiaoxue Yang: Peking University
Lingsheng Ai: Peking University
Zhiwen Gong: Peking University
Ning Jiao: Peking University
Song Song: Peking University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Electrophilic halogenation reactions have been a reliable approach to accessing organohalides. During the past decades, various catalytic systems have been developed for the activation of haleniums. However, there is still a short of effective catalysts, which could cover various halogenation reactions and broad scope of unsaturated compounds. Herein, TEMPO (2,2,6,6-tetramethylpiperidine nitroxide) and its derivatives are disclosed as active catalysts for electrophilic halogenation of olefins, alkynes, and aromatics. These catalysts are stable, readily available, and reactive enough to activate haleniums including Br+, I+ and even Cl+ reagents. This catalytic system is applicable to various halogenations including haloarylation of olefins or dibromination of alkynes, which were rarely realized in previous Lewis base catalysis or Lewis acid catalysis. The high catalytic ability is attributed to a synergistic activation model of electrophilic halogenating reagents, where the carbonyl group and the halogen atom are both activated by present TEMPO catalysis.

Date: 2021
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DOI: 10.1038/s41467-021-24174-w

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