Fig. 2

Rhodium-catalysed direct hydroarylation of alkenes with phosphines. Reaction conditions: 2.5 mol% [Rh(cod)Cl]₂, 1 (0.20 mmol), 2 (0.20 mmol), NaHCO₃ (0.60 mmol) in 1 mL toluene, at 140 °C, 3–4 h, under argon. All reported yields are isolated yields. ^aUsing 2 (0.60 mmol) at 150 °C for 24 h. ^b5 mol% [Rh(coe)₂Cl]₂, 1 (0.20 mmol), 2 (0.60 mmol), K₂CO₃ (0.60 mmol) in 1 mL toluene, at 150 °C, 24 h, under argon. ^cUsing 5 mol% [Rh(cod)Cl]₂, 2 (0.60 mmol) at 150 °C for 24 h