2-Acetoxy-1,4-naphthoquinone undergoes photochemical regio- and stereo-specific (2π+2π) addition to styrene and 1,1-diphenylethene in high yield, whereas the stilbenes yield mainly spirooxetanes: the cyclobutane formation occurs essentially quantitatively in sunlight.
C. Covell, A. Gilbert and C. Richter, J. Chem. Res. (S), 1998, 316 DOI: 10.1039/A800445E
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