acetic acid in water

1: 3,3'-Dichloro-4,4'-diaminobiphenyl With hydrogenchloride; sodium nitrite in water T=-4 - 0°C; 3 h; Cooling with ice; 2: 1-acetoacetylamino-2,4-dimethylbenzene; 1-acetoacetylamino-4-chloro-2,5-dimethoxy-benzene With hydrogenchloride; 1-octadecylguanidinium; acetic acid; 1-octadecylamine; sodium hydroxide in water T=0°C; Cooling with ice; 3: With sodium hydroxide in water pH=4.5;