1.1
Reagents:
Sulfuric acid
Solvents:
Water
;
rt → 0 °C
1.2
Reagents:
Sodium nitrite
;
0.5 h, < 0 °C; 1 h, < 0 °C
1.3
Reagents:
Water
;
0.5 h, cooled
1.4
Solvents:
Toluene
;
2 h, reflux; 1 h, reflux
