Oct-1-yne is smoothly dimerised by the complex [RhCl(PPh3)3] at room temperature to give the branched chain isomer, 7-methylenepentadec-8-yne, as the main product. Other alkynes behave similarly. Phenylacetyene gives E-1,4-diphenylbutenyne and the unstable 1,3-diphenylbutenyne which reacts further to form oligomeric products.
L. Carlton and G. Read, J. Chem. Soc., Perkin Trans. 1, 1978, 1631 DOI: 10.1039/P19780001631
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