Table 1. Homo- and Heterodinuclear CHO/CO2 ROCOP Catalysts Using L1a.
| # | catalyst | time (h) | conv.b(%) | CO2c (%) | polym.d (%) | TONe | TOFf (h–1) | Mn [Đ]g (g mol–1) |
|---|---|---|---|---|---|---|---|---|
| 1 | Mg(II)Mg(II) | 10 | 15 | >99 | >99 | 151 | 15 | 800 [1.13] |
| 2 | Mg(II)Zn(II) | 10 | 34 | >99 | >99 | 344 | 34 | 3100 [1.14] |
| 3 | Mg(II)Mg(II)/Zn(II)Zn(II)(1:1) | 10 | 7 | >99 | >99 | 72 | 7 | <500 |
| 4h | Mg(II)Zn(II) | 3 | 37 | >99 | >99 | 372 | 124 | 10 200 [1.02] 4750 [1.08] |
| 5i | Mg(II)Zn(II) | 0.5 | 44 | >99 | >99 | 4415 | 8830 | 44 400 [1.04] 21 200 [1.05] |
a
Reaction conditions: [Cat]/[CHO] = 1:1000, neat epoxide, 1 bar CO2, 80 °C.36 Note that under these conditions, the Zn(II)Zn(II) did not initiate polymerization, as the study utilized bromide coligands.
b
Conversion of epoxide, determined by 1H NMR.
c
Selectivity for carbonate vs ether, determined by 1H NMR.
d
Selectivity for polymer vs cyclic carbonate, determined by 1H NMR.
e
Turnover number (TON) = total number of moles of epoxide consumed/mol of catalyst.
f
Turnover frequency (TOF) = TON/time (hours).
g
Number average molecular weight [dispersity], determined by GPC.
h
Conditions: [Cat]/[CHO] = 1:1000, 1 bar CO2, 80 °C.37
i
Conditions: [Cat]/[CHO] = 1:10000, 20 bar CO2, 120 °C.37