Abstract

Hexa-2,4-diynal, octa-2,4-diynal, and octa-2,4,6-triynal (R[CC]n·CHO) dimerise in concentrated solution with evolution of carbon monoxide, to give products of the type R[CC]n– 1·CHC(CHO)·[CC]nR; above 100° even phenylpropargyl aldehyde reacts analogously. Both geometrical isomers of the ‘dimers’ were detected and characterised.

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