1.1
Reagents:
Thionyl chloride
Catalysts:
Dimethylformamide
;
20 h, reflux
1.2
Solvents:
Tetrahydrofuran
;
40 min, 0 °C; 0 °C → rt; overnight, rt
1.3
Reagents:
Hydrochloric acid
Solvents:
Water
;
acidified