Potassium Hydroxide → 2-Methoxy-3-(3-nitrophenyl)prop-2-enoic acid

A solution of potassium hydroxide (2.0 g, 35.9 mol) in water (25 ml) was added to a stirred solution of methyl 2-methoxy-3-(3-nitrophenyl)acrylate (8.1 g, 34.2 mmol) in methanol (150 ml) and the resulting mixture was stirred at RT overnight. A further quantity of KOH (0.5 g, 8.9 mmol) in water (10 ml) was added and the mixture heated to 80° C. for 1 hr. The methanol was then evaporated in vacuo and the residue diluted with water (200 ml). The solution was washed with dichloromethane (2×100 ml), filtered through a pad of celite and then acidified by the addition of 3M HCl to pH 3. The mixture was refrigerated for 18 h then the precipitated solid was collected by filtration, washed with water (3×30 ml) and dried in vacuo at 40° C. to give 2-methoxy-3-(3-nitrophenyl)acrylic acid as a yellow solid (6.4 g, 84%).

1. temperaturethe mixture heated to 80° C. for 1 hr
2. customThe methanol was then evaporated in vacuo
3. additionthe residue diluted with water (200 ml)
4. washThe solution was washed with dichloromethane (2×100 ml)
5. filtrationfiltered through a pad of celite
6. additionacidified by the addition of 3M HCl to pH 3
7. waitThe mixture was refrigerated for 18 h
8. filtrationthe precipitated solid was collected by filtration
9. washwashed with water (3×30 ml)
10. customdried in vacuo at 40° C.

ORD record

ord-13bb4db3481e413da9adb45cc65fe8a9

Source dataset

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09345680B2