تفاعل #214958

معادلة التفاعل

dimethyl disulfide

2,4-dibromo-3,5-dimethylthiophene

n-butyl lithium

→

3-bromo-2,4-dimethyl-5-(methylthio)thiophene

المذيبات

ethyl ether

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةthe solution was warmed to -32° C. for 10 minutes
2. 2
   درجة الحرارةcooled again to -70° C
3. 3
   درجة الحرارةwas maintained at -70° C
4. 4
   درجة الحرارةThe resulting solution was warmed to room temperature
5. 5
   workup.STIRRINGstirred for 2 hours
6. 6
   workup.STIRRINGstirred for 15 minutes
7. 7
   استخلاصextracted with ethyl ether
8. 8
   غسيلThe combined ether extracts were washed with water, 5% sodium carbonate, and saturated sodium chloride solution
9. 9
   تجفيفdried over sodium sulfate
10. 10
    ترشيحfiltered
11. 11
    أخرىevaporated

الإجراء التجريبي

20.0 G. of 2,4-dibromo-3,5-dimethylthiophene was dissolved in 300 ml. of anhydrous ethyl ether. The resulting solution was cooled to -70° C. with stirring under argon. 32 Ml. of a 2.4 M solution of n-butyl lithium was added slowly and the solution was warmed to -32° C. for 10 minutes and then cooled again to -70° C. 7.5 G. of dimethyl disulfide was added slowly while the temperature was maintained at -70° C. The resulting solution was warmed to room temperature and stirred for 2 hours then poured into ice water, stirred for 15 minutes, and extracted with ethyl ether. The combined ether extracts were washed with water, 5% sodium carbonate, and saturated sodium chloride solution; dried over sodium sulfate, filtered and evaporated to yield 3-bromo-2,4-dimethyl-5-(methylthio)thiophene.

المصدر