Table 3.
O-Arylation in the presence of FeCI3. 
| FeCI3 | GC Yield (%) | |
|---|---|---|
 |
>98% (Merck) | 85 (ref. 3d) |
| >98% (Aldrich) | 81 | |
| >99.99 (Aldrich) | 32 | |
| >99.99% + 10 ppm Cu2O | 92 | |
| >99.99% + 100 ppm Cu2O | 98 | |
| >99.99% + 1000 ppm Cu2O | 99 |
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