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A mixture of 100 g of 2-propionylthiophene, 161 g of formamide and 98 g of formic acid is stirred at 150°-160 ° C. for 22 hours. After cooling, the mixture is poured into a solution of 30 g of potassium carbonate in 200 ml of water and extracted with ethyl acetate. The extract is washed, dried and evaporated to remove solvent. The residue is distilled under reduced pressure to give 96.5 g of 2-(1-formylaminopropyl) thiophene as a colorless oil. b.p. 154°-156° C./4 mmHg

1. temperatureAfter cooling
2. extractionextracted with ethyl acetate
3. washThe extract is washed
4. customdried
5. customevaporated
6. customto remove solvent
7. distillationThe residue is distilled under reduced pressure