تفاعل #1449960

معادلة التفاعل

2-chloro-4-methyl-1,3-thiazole

thionyl chloride

chlorosulfonic acid

→

product

2-Chloro-4-methyl-1,3-thiazole-5-sulfonyl chloride

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةThe solution is heated
2. 2
   درجة الحرارةto reflux for 48 h
3. 3
   استخلاصextracted with 4×400 ml of dichloromethane
4. 4
   غسيلThe combined organic phases are washed with 2.5 l of water
5. 5
   تجفيفdried over sodium sulfate
6. 6
   تركيزconcentrated
7. 7
   workup.DISTILLATIONDistillation of the crude product

الإجراء التجريبي

150 g (1.12 mol) of 2-chloro-4-methyl-1,3-thiazole are added dropwise at room temperature to a solution of 331 g (2.81 mmol) of thionyl chloride in 653 g (5.61 mmol) of chlorosulfonic acid. The solution is heated to reflux for 48 h. The mixture is then added to 3 l of ice-water and extracted with 4×400 ml of dichloromethane. The combined organic phases are washed with 2.5 l of water, dried over sodium sulfate and concentrated. Distillation of the crude product results in 233.7 g of product in the form of an oil. (Boiling point 87-96° C., 0.7 mbar, GC 98.1%, yield 89.6%).

المصدر