ROP of ε-CL catalysed by the Li complexes under solvent-free conditions.
| Run | Catalyst | ε-CL : Li | T (°C) | Time (h) | Conversiona (%) | M n b , c | M ncalc d | PDIb |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 100 : 1 | 130 | 24 | None | — | — | — |
| 2e | 24 | None | — | — | — | |||
| 3 | 2 | 24 | 45 | 1800 | 5130 | 1.25 | ||
| 4 | 4 | 24 | None | — | — | — | ||
| 5 | 5 | 1f | 40 | 14 640 | 4560 | 2.01 | ||
| 6e | 24 | 17% | nd | nd | ||||
| 7 | 6 | 10 min | >99 | 27 000 | 11 290 | 1.67 | ||
| 8e | 24 | 17 | — | — | — | |||
| 9 | 7 | 1f | 80 | 16 130 | 9130 | 1.78 | ||
| 10e | 24 | 14 | — | — | — | |||
| 11 | 8 | 15 minf | 72 | 27 520 | 8210 | 1.76 | ||
| 12e | 24 | None | — | — | — | |||
| 13 | 9 | 6 | 77 | 17 040 | 8780 | 2.05 | ||
| 14e | 24 | None | — | — | — |
a
Determined by 1H NMR spectroscopy on crude reaction mixture.
b
From GPC.
c
Values corrected considering Mark–Houwink factor (0.56) from polystyrene standards in THF.
d
Calculated from ([Monomer]0/[Cat.]0) × conv. (%) × monomer molecular weight.
e
Reaction performed in air.
f
Stirring stopped due to the polymer formation.