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

Beteiligte Stoffe

Reaktionsschritte

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.

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