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Solvent effects on the photocyclization of 2'-hydroxychalcones to flavanones.
| 2'-Hydroxychalcone | Benzene | CCl4 | CHCl3 | Et2O | EtOAc | 1,4-dioxane | ACN | EtOH | t-BuOH |
|---|---|---|---|---|---|---|---|---|---|
| 86 | |||||||||
| a | 87a | 87a | - | 87a | 87a | 87a | 87a | 87a | - |
| b | 87b | - | - | 87b | 87b | 87b | 87b | 87b | - |
| c | 87c | - | - | 87c | 87c | 87c | - | - | - |
| d | 87d | - | - | 87d | 87d | 87d | - | - | - |
| e | 87e | - | - | 87e | 87e | - | - | - |
