The formation of cyclobutadiene radical cations by the cycloaddition reaction between an alkyne and an alkyne radical cation has been established by solid state e.s.r. spectroscopy.
J. L. Courtneidge, A. G. Davies, S. M. Tollerfield, J. Rideout and M. C. R. Symons, J. Chem. Soc., Chem. Commun., 1985, 1092 DOI: 10.1039/C39850001092
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