1.1
Reagents:
Acetic acid
,
Hydrochloric acid
Solvents:
Water
;
rt → 10 °C
1.2
Reagents:
Sodium nitrite
Solvents:
Water
;
-5 °C; 45 min, -5 °C
1.3
Reagents:
Sulfur dioxide
Catalysts:
Cupric chloride
,
Cuprous chloride
Solvents:
Acetic acid
;
30 min, rt; rt → 10 °C; < 30 °C
1.4
Reagents:
Water
;
cooled

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