Figure 7.

Top: Reaction profiles at 140 °C and 75 bar CO₂, 2 (2.83 mmol), A (2 mol %), [Bu₄N]Br (3 mol %), biphenyl (10 mol %) as an internal standard. Commercial 2 was sourced from Sigma–Aldrich, trans‐2 has been synthesised in the procedure described in the Supporting Information, it is optically 100 % trans‐2 containing 10 % impurities (see the Supporting Information IVc). Bottom: ¹H NMR spectra showing reaction progress. The presented spectra correspond to data points collected for commercial 2 (57:43 trans/cis).