Irradiation of 2-(1 -propynyl)-2,5,5-trimethylcyclopentanone 1leads to the isomeric allenic cycloheptadienone4, which dimerizes spontaneously at the βγ double bond to yield the transhead-to-head dimer2.
D. Venugopal, L. D. Todaro, P. Margaretha and W. C. Agosta, J. Chem. Soc., Chem. Commun., 1993, 1014 DOI: 10.1039/C39930001014
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