Table 5.
The influence of temperature on trans‐3 synthesis.
|
Entry |
Catalyst |
T [°C] |
t [h] |
Conv. [%][b] |
Selectivity trans‐3 [%] |
trans/cis 3 |
|---|---|---|---|---|---|---|
|
1 |
A+[Bu4N]Br |
140 |
4.5 |
65 |
80 |
1:0 |
|
2 |
A+[Bu4N]Br |
120 |
4.5 |
42 |
78 |
1:0 |
|
3 |
A+[Bu4N]Br |
80 |
4.5 |
10 |
45 |
1:0 |
|
4 |
A+[Bu4N]Br |
40 |
4.5 |
5 |
0 |
– |
[a] Reaction conditions: trans‐2 (1.73 mmol) (see the Supporting Information IVc), A (2 mol %), [Bu4N]Br (3 mol %), biphenyl (10 mol %) as an internal standard, stirrer speed 300 rpm, 75 bar CO2 at 40 °C. [b] Determined from quantitative 1H NMR spectroscopy.