fig15

Figure 15. Suitability studies of substrates. Reaction conditions: (a) Propargyl amines 1 (0.2 mmol), catalyst (10 mg), 15 vol.% CO₂/N₂, DMSO (1 mL), 12 h, r.t.; (b) Propargyl amines 1 (0.2 mmol), catalyst (10 mg), coal-fired flue gas, DMSO (1 mL), 36 h, r.t.