The variation of the yields of the nickel-mediated [2 + 2 + 2] co-cyclisation of a hepta-1,6-diyne with alkynols and alkynol ethers in a regular fashion dependent on the position and steric environment of the oxygen atom is strongly indicative that this atom ligates with the metal during the reaction.
P. Bhatarah and E. H. Smith, J. Chem. Soc., Perkin Trans. 1, 1990, 2603 DOI: 10.1039/P19900002603
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