On irradiation (λ=350 nm) in the presence of 2,3-dimethylbut-2-ene or 2-methylpropene the title compound 2 undergoes cycloaddition at the C(9)–C(10) double bond selectively (>15:1) to afford the 8a,9,10,10a-tetrahydro-2H,8H-cyclobuta[c]pyrano[2,3-f][1]benzopyran-2,8-diones 3.
J. Bethke, P. Margaretha, A. M. Wynne and R. A. Caldwell, J. Chem. Res. (S), 1998, 142 DOI: 10.1039/A707819F
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