Photochemical addition of phenanthraquinone (4) to alkyl-substituted alkoxyacetylenes gives rise to the 1,3-dioxoles (7)via a 1,2-hydrogen shift in the intermediate (6).
H. J. T. Bos, H. Polman and P. F. E. van Montfort, J. Chem. Soc., Chem. Commun., 1973, 188a DOI: 10.1039/C3973000188A
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