Hexa-2,4-diynal, octa-2,4-diynal, and octa-2,4,6-triynal (R[C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
C]n·CHO) dimerise in concentrated solution with evolution of carbon monoxide, to give products of the type R[CC]n– 1·CH![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C(CHO)·[CC]nR; above 100° even phenylpropargyl aldehyde reacts analogously. Both geometrical isomers of the ‘dimers’ were detected and characterised.
R. K. Bentley, U. Graf, E. R. H. Jones, R. A. M. Ross, V. Thaller and R. A. V. Hodge, J. Chem. Soc. C, 1969, 683 DOI: 10.1039/J39690000683
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