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| catalyst | solvent | Kobs × 105 (s–1) | K+ (rel. rate) (s–1) |
|---|---|---|---|
| Et3N | DCM | 42 | 4.6 |
| Et3N | CH3CN | 21 | 2.3 |
| Et3N | CH3CN-H2O (97:3) | 192 | 21.3 |
| LiOAc | CH3CN-H2O (97:3) | 209 | 23.2 |
| TBATFA | DCM | 13 | 1.4 |
| TBATFA | CH3CN | 9 | 1 |
| TBATFA | CH3CN-H2O (97:3) | 44 | 4.8 |
