The thermal dimerization of three [n]cumulenes (n = 5, 7, and 9) has been investigated, and a common reactivity pattern is observed that gives radialenes and expanded radialenes through regioselective cycloaddition reactions; all three products are characterized using X-ray crystallography.
![Graphical abstract: Thermal dimerization of [n]cumulenes (n = 5, 7, 9)](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C5CC05679A&imageInfo.ImageIdentifier.Year=2015)
D. Wendinger, J. A. Januszewski, F. Hampel and R. R. Tykwinski, Chem. Commun., 2015, 51, 14877 DOI: 10.1039/C5CC05679A
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