1: 3-Amino-4-ethyl benzoic acid With boron trifluoride diethyl etherate in tetrahydrofuran; chloroform T=-12°C; 0.333333 h; 2: tert.-butylnitrite in tetrahydrofuran; chloroform T=5°C; 1.5 h; 3: With potassium acetate; 18-crown-6 ether in tetrahydrofuran; chloroform T=20°C; 40 h;

1: With water; potassium carbonate in methanol 2 h; Heating / reflux; 2: With potassium hydrogensulfate in water pH=3 - 3.5;