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Intramolecular [2+2] photocycloadditions solvent screen
| entry | solvent | 14a | 14b | yield(%) |
|---|---|---|---|---|
| (1) | acetone/H2O | >20 | 1 | 60 |
| (2) | methanol | >20 | 1 | 65 |
| (3) | acetonitrile | 5 | 3 | 77 |
| (4) | diethyl ether | 2 | 1 | 90 |
| (5) | dichloromethane | 1 | 6 | 80 |
| (6) | pentane | 1 | 2 | 63 |
| (7) | cyclohexane | 1 | 3 | 42 |
