Fig. 8. Evolution of ee% or Michael adduct yield versus time when the Michael addition of propanaldehyde (1 mmol) to β-nitrostyrene (0,1 mmol) was performed in DCM (1 mL), at 15 °C, with 10 mol% nitrophenol and 20 mol% HybPyr catalyst. Selectivity towards Michael adducts was >99%.