New structures are assigned to vinyl bromides obtained by treatment of N-bromosuccinimide with 2,2-dimethylchromans, and the mechanism is shown to involve addition of the reagent to an intermediate chromene; the abnormal reaction also occurs with a dihydrofuranoquinoline.
M. F. Grundon and K. J. James, J. Chem. Soc. D, 1970, 1427 DOI: 10.1039/C29700001427
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