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The Taming of Cyclobutadiene

Authors

  • Prof. Donald J. Cram,

    Corresponding author
    1. Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, CA 90024 (USA)
    • Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, CA 90024 (USA)
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  • Dr. Martin E. Tanner,

    1. Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, CA 90024 (USA)
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  • Dr. Robert Thomas

    1. Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, CA 90024 (USA)
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  • We warmly thank the National Science Foundation for Grant NSF CHE 8802800, the U.S. Public Health Service for Grant GM-12640. and S.E.R.C./N.A.T.O. for support for R. T.

Abstract

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The taming of cyclobutadiene was accomplished in the interior of the hemicarcerand 1. Cyclobutadiene is a stable compound with a singlet ground state when it is synthesized in the interior of 1. In order to synthesize the incarcerated cyclobutadiene and to characterize its structure, one bimolecular, three photochemical, and two thermal reactions were carried out in the interior of 1. The authors consider it both realistic and useful to regard the internal phase of carcerands and hemicarcerands as a new state of matter.

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