1: With pyridine; acetic anhydride T=90°C; 2 h; 2: With quinoline; Cr2Cu2O5 0.25 h; Heating / reflux; 3: With hydrogenchloride; sodium hydroxide; water Product distribution / selectivity; more than 3 stages;

sodium hydroxide in N,N-dimethyl-formamide Product distribution / selectivity;