Reaction of polyenes (4a, b) with 2,4,4,6-tetrabromocyclohexa-2,5-dienone at –20 °C in the presence of MeCN and subsequent quenching with water gives monocyclic amides (8a, b) and (9a, b), while the cycloalkene (7a, b) was formed during the reaction at room temperature; acoratriene (12) was elaborated from (7b)via a ring contraction product (10b).
T. Kato, M. Mochizuki, T. Hirano, S. Fujiwara and T. Uyehara, J. Chem. Soc., Chem. Commun., 1984, 1077 DOI: 10.1039/C39840001077
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