Table 3. Copolymerisation of limonene oxide and carbon dioxide with catalyst 1 under different reaction conditions a .
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Entry | [LO] : [1] | % trans LO | V (tol) [mL] | Pressure [bar] | Temperature [°C] | Time [h] | Yield [%] | Yield trans-LO [%] | trans/cis*/trans* b [%] | TOF c , d | M n (PDI) e [g mol–1] |
1 | 250 | 84 | 2 | 30 | 25 | 16 | 68 | 81 | 100 : 0 : 0 | 60 c | 62.000 (1.7) |
2 | 250 | 84 | 2 | 30 | 40 | 16 | 73 | 88 | 99.6 : 0.3 : 0 | 180 c | 32.500 (1.9) |
3 | 250 | 84 | 2 | 30 | 60 | 16 | 17 | 20 | 94 : 5 : 1 | 40 c | 4.300 (1.6) |
4 | 250 | 54 | 2 | 30 | 40 | 16 | 51 | 94 | 96 : 2 : 2 | 110 c | 10.000 (1.3) |
5 | 250 | 54 | 2 | 30 | 60 | 16 | 11 | 21 | 95 : 3 : 2 | 30 c | 7.200 (1.7) |
6 | 250 | >99 | 2 | 30 | 40 | 6.5 | 59 | 59 | 100 : 0 : 0 | 120 c | 145.300 (1.3) |
7 | 250 | >99 | 2 | 30 | 60 | 16 | 26 | 26 | 97 : 3 : 0 | 110 c | 56.100 (2.5) |
8 | 500 | 84 | 2 | 30 | 40 | 16 | 46 | 55 | 97 : 3 : 0 | 110 c | 19.000 (2.5) |
9 | 500 | 84 | 0 | 30 | 40 | 3 | 35 | 42 | 99 : 1 : 0 | 60 d | 24.000 (1.9) |
10 | 500 | 84 | 0 | 30 | 60 | 0.66 | 20 | 24 | 95 : 5 : 0 | 130 d | 4.900 (1.9) |
11 | 500 | 84 | 0 | 30 | 80 | 3 | 0 | 0 | — | — | — |
12 | 500 | 84 | 0 | 10 | 60 | 3 | 0 | 0 | — | — | — |
13 | 500 | 84 | 0 | 50 | 60 | 0.5 | 30 | 36 | 98 : 2 : 0 | 310 d | 12.800 (1.8) |
14 | 500 | 84 | 0 | 50 | 60 | 16 | 40 | 50 | 96 : 4 : 0 | 15 d | 9.500 (2.6) |
15 | 1000 | 84 | 0 | 50 | 60 | 3.5 | 13 | 16 | 95 : 5 : 0 | 40 d | 6.000 (2.1) |
a Volume (LO) = 5.0 mL (30.5 mmol).
b Selectivity for trans/cis*/trans*-PLimC was determined by 13C NMR spectroscopy (ESI).
c In situ TOF is determined by a calibration curve S5, intensity ν(C O) vs. n(PLimC).
d TOF is defined as TON/time.
e Determined by GPC, calibrated with polystyrene standards in chloroform.