Table 3.
[2+2] Photocycloadditions of 27 and 28
| entry | enone | products | solvent/yield/ratio | |
|---|---|---|---|---|
| (1) | ![]() |
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CH2Cl2 25% 32/33 (3:1) acetone/H2O 25% 32/33 (>1:20) |
| (2) | ![]() |
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CH2Cl2 60% 35/36 (2:1) acetone/H2O 64% 35/36 (>20:1) |
All reactions: hv, Pyrex filter , [3 mM].





