1.1
Reagents:
Hydroxyamine hydrochloride
,
Sulfuric acid
Solvents:
Acetonitrile
;
25 °C; 10 min, 25 °C
1.2
Reagents:
Hydrochloric acid
,
Titanium chloride (TiCl3)
Solvents:
Water
;
25 °C; 10 min, 25 °C
1.3
Reagents:
Citric acid, sodium salt
,
Sodium hydroxide
Solvents:
Water
;
basified, 25 °C


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