Table 3.
Copolymerization of CHO and CO2
| Entry | Complex | [CHO]/[Cat] | Time (h) | [CHO] (mol l−1) | Temperature (°C) | Yielda | TOFb (h−1) | Selectivityc (% PPC) | M n d (kg mol−1) | PDId |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1,000 | 10 | 50 | 60 | 25.6 | 25.6 | >99 | 21.6 | 1.2 |
| 2 | 2 | 1,000 | 10 | 50 | 60 | 10.4 | 12.2 | 85 | 9.3 | 1.4 |
| 3 | 3 | 1,000 | 10 | 50 | 60 | 17.0 | 17.5 | 97 | 14.4 | 1.2 |
| 4 | 4 | 1,000 | 10 | 50 | 60 | 18.9 | 19.7 | 96 | 17.1 | 1.2 |
| 5 | 5 | 1,000 | 10 | 50 | 60 | 15.8 | 16.6 | 95 | 14.5 | 1.3 |
| 6 | 6 | 1,000 | 10 | 50 | 60 | 0.44 | 2.2 | 20 | 2.1 | 1.5 |
Copolymerizations run in neat cyclohexene oxide (CHO) with [Co]/[[PPN]Cl] = 1:1 at 1.5 MPa of CO2 in 1,4-dioxane (7 ml)
aBased on isolated poly(cyclohexene carbonate) yield
bTurnover frequency: mol CHO mol Co−1 h−1
cDetermined by 1H NMR spectroscopy (CDCl3, 300 MHz)
dDetermined by gel permeation chromatography calibrated with polystyrene standards in tetrahydrofuran at 40 °C