Potassium Hydroxide → 5-(2-Thienyl)valeric acid

Temperature

120 °C

4-(2-thenoyl)butyric acid (9.2 g) was dissolved in 60 ml of diethylene glycol and 30 ml of hydrazine hydrate added. After heating the mixture to 120° C. gradual addition of potassium hydroxide (13.6 g) was begun. Low boiling components were distilled out of the reaction mixture until the reaction mixture temperature reached 210° C. After cooling to room temperature water was added to the reaction mixture followed by 6N hydrochloric acid. This mixture was extracted with benzene, the benzene dried over sodium sulfate, filtered through a pad of charcoal, and concentrated under vacuum. A solid residue was obtained after trituration with ligroine, cooling and scratching. Yield 5.5 g. N.M.R. (CDCl3)δ1.76 (m, 4H), 2.42 (m, 2H), 2.88 (m, 2H), 6.80 (m, 1H), 6.90 (m, 1H), 7.12 (m, 1H).

1. distillationwere distilled out of the reaction mixture until the reaction mixture temperature
2. customreached 210° C
3. temperatureAfter cooling to room temperature water
4. additionwas added to the reaction mixture
5. extractionThis mixture was extracted with benzene
6. dry with materialthe benzene dried over sodium sulfate
7. filtrationfiltered through a pad of charcoal
8. concentrationconcentrated under vacuum
9. customA solid residue was obtained after trituration with ligroine
10. temperaturecooling

ORD record

ord-14b074c3d5cf47bb8322f360433d040d

Source dataset

uspto-grants-1987_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04665090