Table 2 Results of rac-DL polymerization by yttrium catalysts (R,R)- and (S,S)-4d/BnOH
Run | Catalyst | [rac-DL]/[4d] | Time (min) | Conv. (%) | Mn (kg mol−1) | Ð (Mw/Mn) | [mm] (%) | Tma (°C) | [α]D23 (°)b | e.e.c (%) |
|---|---|---|---|---|---|---|---|---|---|---|
1 | (R,R)-4d | 400/1 | 20 | ~50 | 43.0 | 1.07 | >99 | 172 | −94.8 | >99 |
2 | (R,R)-4d | 800/1 | 20 | ~50 | 74.8 | 1.05 | >99 | 172 | −94.5 | >99 |
3 | (R,R)-4d | 1600/1 | 60 | 43 | 118 | 1.09 | >99 | 175 | −73.6 | 80 |
4 | (S,S)-4d | 400/1 | 20 | ~50 | 42.9 | 1.08 | >99 | 172 | +93.7 | >99 |
5 | (S,S)-4d | 800/1 | 20 | ~50 | 72.1 | 1.04 | >99 | 172 | +94.6 | >99 |
6 | (S,S)-4d | 1600/1 | 60 | 44 | 113 | 1.07 | >99 | 175 | +76.1 | 85 |
