1: With sodium hydroxide; bromine in water T=5 - 40°C; 0.5 h; 2: With sulfuric acid in 2-methyl-propan-1-ol; water T=30 - 33°C; pH=3; 3: With tributyl-amine in 2-methyl-propan-1-ol T=0 - 20°C; 1 h;

1: With sodium hydroxide; bromine in water T=5 - 35°C; 2: With sulfuric acid in 2-methyl-propan-1-ol; water T=35°C; pH=0.5 - 3; 3: With tributyl-amine T=0 - 20°C; 2 - 8 h;