Photocyclodimers of 'Made-to-Measure' Seven- and Six-Membered Cyclic Enones

[摘要]：On irradiation (350 nm) in benzene as solvent, dioxepinone 6 and benzoxepinone 7 afford quantitatively mixtures of two diastereoisomeric head-to-head dimers, respectively. In both cases, on contact with SiO2 the minor dimer containing trans-ring fusions undergoes spontaneous isomerization to the (major) cis-transoid-cis diastereoisomer. In contrast, thiopyranone 8 is converted selectively, but in very low yield, to dimer 13.

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