Cohalogenation of alkenes 6 by N-bromosuccinimide (NBS) in 3-methylpent-2-en-4-yn-1-ol provides β-bromo-3-methylpent-2-en-4-ynyl ether 7 precursors of 3-(penta-1,3,4-trienyloxy)cycloalkenes 9 which react chemo-and regio-selectively with NBS in methanol to give bromovinyl acetals10.
J. Dulcère, V. Agati and J. Rodriguez, J. Chem. Soc., Chem. Commun., 1993, 1038 DOI: 10.1039/C39930001038
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