Abstract
Cycloheptatriene, a seven-membered ring polyene, was obtained by Ladenburg (118) in 1881, and by Merling (122) in 1891, by the systematic degradation of an alkaloid, tropine. Its structure was established by Willstätter (241) by synthesis. This substance, called tropilidene, was a very unstable yellow oil and did not show any aromatic character, in contrast to the corresponding six-membered “polyene”, viz. benzene. At the same time Merling had obtained a yellow, crystalline product by heating tropilidene with bromine but was unable to establish its structure.
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References
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Addendum
Kloster-Jensen, E., N. Tarköy, A. Eschenmoser und E. Heilbronner: Untersuchungen in der Benztropylium-Reihe. III. 2,7-Polymethylen-4,5-benztropone. Helv. Chim. Acta 39, 786 (1956).
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Nozoe, T. (1956). Natural Tropolones and Some Related Troponoids. In: Ƶechmeister, L. (eds) Fortschritte der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products / Progrès dans la Chimie des Substances Organiques Naturelles. Fortschritte der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products / Progrès dans la Chimie des Substances Organiques Naturelles, vol 13. Springer, Vienna. https://doi.org/10.1007/978-3-7091-8032-7_4
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