Table 1. Use of bifunctional catalytic system with chain transfer agents (CTAs) and effect of equivalents of AdA on molecular weight a .
| ||||||
| Entry | CTA | Equiv. CTA b | Conv. c (%) | M n theo (kDa) | M n d (kDa) | Đ d |
| 1 | AdA | 2 | >99 | 32.6 | 12.2 | 1.04 |
| 2 | AdA | 5 | >99 | 16.1 | 7.1 | 1.04 |
| 3 | AdA | 10 | >99 | 8.7 | 4.2 | 1.07 |
| 4 | AA | 5 | >99 | 16.1 | 7.9 | 1.04 |
| 5 | TA | 5 | >99 | 16.1 | 6.9 | 1.06 |
| 6 | PEG600-diacid | 5 | 99 | 16.1 | 6.9 | 1.06 |
| 7 e | 1,6-HD | 5 | 97 | 15.7 | 7.6 | 1.04 |
| 8 e | BD | 5 | >99 | 16.1 | 7.3 | 1.04 |
a[PO] : [CPCA] : [1a] : [1b] = 2000 : 400 : 1 : 0.9 VPO = 0.9 mL VMeCN = 0.6 mL. MeCN was added as the solvent in stock solutions of 1a and 1b.
bEquivalents of CTA relative to 1a.
cConversion of anhydride determined by 1H NMR spectroscopy.
dDetermined by GPC in THF at 30 °C relative to polystyrene standards.
eWhen a diol is used as the CTA it should be noted that there is an anhydride prior to the repeat unit.