Table 4.

Reactivity of different mixtures of cis‐2 and trans‐2 towards CO₂ insertion.^[a]

Entry	trans/cis 2	t [h]	Conv. [%][b]	trans/cis 2 (after reaction)	Chemoselectivity 3 [%]	trans/cis 3
1	0:100	24	60	0:100	12	0:100
2	13:87	24	80	13:87	26	55:45
3	57:43	24	83	33:67	64	99:1
4	97:3	24	91	91:9	85	99:1
5	97:3	4.5	60	96:3	95	98:2
6	100:0	4.5	61	100:0	89	100:0

[a] Reaction conditions: 2 (4.6 mmol), [Bu₄N]Br (3 mol %), A (2 mol %), biphenyl (10 mol %) as an internal standard, 140 °C, 75 bar CO₂ at 40 °C, solventless. [b] Determined from quantitative ¹H NMR spectroscopy.