Fig. 4: Substrate scope^a.

^aReaction conditions: silafluorene 4 (0.20 mmol) and acid anhydride 5 (0.30 mmol, 1.5 equiv), [Rh(CO)₂Cl]₂ (0.005 mmol, 2.5 mol%), L7 (0.021 mmol, 10.5 mol%) and base (30 mol%, Na₂CO₃ for aliphatic anhydride, Cs₂CO₃ for aromatic anhydride) in 1,4-dioxane (4.0 mL) at 70 °C for 24 h. ^bThe reaction was performed with L1 as the ligand at 50 °C for 48 h.