1: 4-bromo-benzaldehyde With (1R,2R)-cyclohexane-1,2-diylbis(2-azaethenyl-3-tert-butyl-2-hydroxybenzo-5-sulfonic acid) disodium salt; Manganese (II) acetate in methanol T=20°C; 0.5 h; 2: sodium cyanide in methanol T=20°C; 24 h; optical yield given as percent eeenantioselective reaction;