Chloromethyl Methyl Ether → 3-(Chloromethyl)-2,5-dimethylthiophene

36.4 G., 0.325 mol. of 2,5-dimethylthiophene, 24.7 g. (0.307 mol) of freshly distilled chloromethyl methyl ether (b.p. 58°-60° C.) and 87.0 g. of glacial acetic acid were combined in a glass pressure bomb and stirred at room temperature for 5 hours. After 0.5 to 1 hr. an exothermic reaction took place. The reaction mixture was cooled externally in an ice bath so that the reaction temperature did not exceed 35° C. The color of the mixture changed from green to blue. The resulting solution was poured into ice water, stirred for ten minutes and extracted four times with benzene. The combined benzene extracts were washed twice with saturated sodium chloride solution, dried and evaporated. The resulting liquid was quickly distilled and the material which boiled at 90°-125° C./18 mm. was collected. A second distillation yielded the pure product, b.p. 109°-115° C./18 mm.

1. waitAfter 0.5 to 1 hr
2. customan exothermic reaction
3. temperatureThe reaction mixture was cooled externally in an ice bath so that the reaction temperature
4. customdid not exceed 35° C
5. stirringstirred for ten minutes
6. extractionextracted four times with benzene
7. washThe combined benzene extracts were washed twice with saturated sodium chloride solution
8. customdried
9. customevaporated
10. distillationThe resulting liquid was quickly distilled
11. customwas collected
12. distillationA second distillation
13. customyielded the pure product, b.p. 109°-115° C./18 mm

ORD 기록

ord-7a5c6a7b7e4947238e64bca2937f625d

출처 데이터셋

uspto-grants-1981_03

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US04256878