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A Diels–Alder super diene breaking benzene into C2H2 and C4H4 units

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  • Yusuke Inagaki

    (Graduate School of Pure and Applied Sciences, University of Tsukuba)

  • Masaaki Nakamoto

    (Graduate School of Pure and Applied Sciences, University of Tsukuba)

  • Akira Sekiguchi

    (Graduate School of Pure and Applied Sciences, University of Tsukuba)

Abstract

Cyclic polyene with six carbon atoms (benzene) is very stable, whereas cyclic polyene with four carbon atoms (cyclobutadiene) is extremely unstable. The electron-withdrawing pentafluorophenyl group of a substituted cyclobutadiene lowers the energy of the lowest unoccupied molecular orbital, greatly increasing its reactivity as a diene in Diels–Alder reactions with acetylene, ethylene and even benzene. Here we show that the reaction with benzene occurs cleanly at the relatively low temperature of 120 °C and results in the formal fragmentation of benzene into C2H2 and C4H4 units, via a unique Diels–Alder/retro-Diels–Alder reaction. This is a new example of the rare case where breaking the C–C bond of benzene is possible with no activation by a transition metal.

Suggested Citation

  • Yusuke Inagaki & Masaaki Nakamoto & Akira Sekiguchi, 2014. "A Diels–Alder super diene breaking benzene into C2H2 and C4H4 units," Nature Communications, Nature, vol. 5(1), pages 1-6, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4018
    DOI: 10.1038/ncomms4018
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