1: 2-amino-4-chloro-5-methylbenzene sulfonic acid With sodium hydroxide in water 2: With hydrogenchloride; sodium acetate; sodium nitrite in water T=10°C; pH=3 - 4; 3: 3-hydroxy-5,6,7,8-tetrahydro-2-naphthoic acid in water T=15 - 60°C; 3.5 h;