Tri-tert-butylazete—The First Kinetically Stabilized Azacyclobutadiene

Authors

  • Dipl.-Chem. Uwe-Josef Vogelbacher,

    1. Fachbereich Chemie der Universität, Erwin-Schrödinger-Strasse, D-6750 Kaiserslautern (FRG)
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  • Prof. Dr. Manfred Regitz,

    Corresponding author
    1. Fachbereich Chemie der Universität, Erwin-Schrödinger-Strasse, D-6750 Kaiserslautern (FRG)
    • Fachbereich Chemie der Universität, Erwin-Schrödinger-Strasse, D-6750 Kaiserslautern (FRG)
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  • Dr. Richard Mynott

    1. Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-4330 Mülheim an der Ruhr (FRG)
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  • Syntheses with Cyclobutadienes, Part 16. This work was supported by the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie.—Part 15: H. Wingert, G. Maas, M. Regitz, Tetrahedron, in press.

Abstract

original image

The antiarene 1 is remarkably stable. It was prepared as the first kinetically stabilized (electronically pure) azacyclobutadiene. 1 tolerates several days' heating at 100°C in toluene! The valence isomerism 1A⇄1B is immediately detectable by temperature-dependent 13C-NMR spectroscopy.

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