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| Entry | 1,4-Dioxane/water (vol/vol) | PTC (mol%)a | DIT yield (η%) |
|---|---|---|---|
| 1 | 70/30 | 0 | 91 |
| 2 | 35/65 | 15 | 86 |
| 3 | 0/100 | 0 | 78 |
| 4 | 70/30 | 30 | 97 |
| 5 | 0/100 | 30 | 95 |
TBANP phase transfer catalyst with respect to 2,5-dibromothiophene substrate.
