Abstract
IT is an interesting fact that neitherjpentalene (1), nor heptalene (2), nor any derivatives of them have been definitely reported as being synthesized1 or found to occur naturally. Azulene (3) is, on the other hand, a substance which can be made by the established procedures of organic chemistry and it is known in Nature.
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References
Horn, Nunn and Rapson, Nature, 160, 830 (1947).
Hückel, Z. Phy., 70, 204 (1931).
Coulson and Rushbrooke, Proc. Comb. Phil. Soc., 36, 193 (1940).
Penney, Proc. Roy. Soc, A, 158, 306 (1937).
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CRAIG, D., MACCOLL, A. The Non-Benzenoid Aromatic Hydrocarbon Pentalene. Nature 161, 481 (1948). https://doi.org/10.1038/161481b0
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DOI: https://doi.org/10.1038/161481b0
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