When di-t-butyl peroxide is photolysed in the presence of an alkyne (RC![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
CR) under acidic conditions, the resulting protonated t-butoxyl radical adds to the triple bond, and the e.s.r. spectra of the corresponding alkoxyalkene or vic-dialkoxyalkene radical cations (ButOCR![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CHR˙+ or ButOCRCROBut·+) can be observed.
A. J. Bloodworth, A. G. Davies and R. S. Hay-Motherwell, J. Chem. Soc., Chem. Commun., 1988, 862 DOI: 10.1039/C39880000862
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