Table 3.
1,2‐Limonene carbonate synthesis from commercially available 1,2‐limonene oxide.[a]
|
| ||||||
|---|---|---|---|---|---|---|
|
Entry |
Catalyst [mol %] |
T [°C] |
p [bar][b] |
Conv. [%][c] |
Chemoselectivity 3 [%][c] |
trans/ cis 3 |
|
1 |
[Bu4N]Br (3) |
140 |
30 |
79 |
20 |
96:4 |
|
2 |
[Bu4N]Br (3) |
140 |
75 |
61 |
41 |
94:6 |
|
3 |
A (2)+[Bu4N]Br (3) |
140 |
75 |
73 |
53 |
92:8 |
|
4 |
[Bu4N]Br (5) |
140 |
75 |
95 |
52 |
95:5 |
[a] Reaction conditions: 2 (2.3 mmol), biphenyl (10 mol %) as an internal standard, 24 h, solventless. [b] Pressure of CO2 at 40 °C. [c] Determined by quantitative 1H NMR spectroscopy.