2-Bromo-1,6-dienes are catalytically cylised to give conjugated 5-membered bis-exocylic dines and 6-membered mono-exocyclic dienes by rhodium and palladium catalysts, the specificity for a 5- or 6-membered ring being a function of substrate, catalyst, and added base; 2-bromo-1,7-dienes cyclise regiospecifically to give 6-membered rings.
R. Grigg, P. Stevenson and T. Worakun, J. Chem. Soc., Chem. Commun., 1984, 1073 DOI: 10.1039/C39840001073
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