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| Entries | Time (h) | Yield (%) | M w | M z | Đ |
|---|---|---|---|---|---|
| 1 | 2 | Trace | — | — | — |
| 2 | 6 | 15 | 1900 | 2400 | 1.26 |
| 3 | 12 | 46 | 7600 | 10 600 | 1.39 |
| 4 | 24 | 70 | 7600 | 10 700 | 1.41 |
Carried out in DMF at r.t., concentration: [1] = 0.213 M. [1] : [2] : [3] = 2 : 2 : 1.
