New double annulation reactions of 1,5-diynes with activated alkenes are catalysed by cobalt(0) complexes, and can also occur in the absence of cobalt to give new classes of compounds, containing exocyclic double bonds, if terminal methyl groups are present on the triple bonds.
Z. Zhou, L. P. Battaglia, G. P. Chiusoli, M. Costa, M. Nardelli, C. Pelizzi and G. Predieri, J. Chem. Soc., Chem. Commun., 1990, 1632 DOI: 10.1039/C39900001632
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