Chloroacetic Acid → [(2-Propanylideneamino)oxy]acetic acid

Temperature

30 °C

47.3 Grams (0.5 moles) of chloroacetic acid was dissolved in 55 g (0.55 moles) of an aqueous solution of 40% sodium hydroxide. To the solution, 36.5 g (0.5 moles) of acetone oxime was added, and then 55 g (0.55 moles) of an aqueous solution of 40% sodium hydroxide was added dropwise to the mixture while maintaining a temperature at not higher than 30° C. Reaction was subsequently performed with the solution being allowed to flow at a rate of 4 ml/min into a glass tube (10 mm in diameter and 100 mm in length) that was heated at 90°-100° C. The unreacted acetone oxime was removed from the reaction solution by two extractions with 100 ml of ether. The pH of the remaining aqueous solution was adjusted to 1 with concentrated HCl. The solution was subsequently saturated with sodium chloride. The resulting aqueous solution was subjected to two extractions with 100 ml of ether and the extract was dried with magnesium sulfate. Ether was distilled off under vacuum and the residue was distilled under vacuum to obtain isopropylidene aminooxyacetic acid (m.p. 76° C.) in an amount of 16.3 g (yield, 25 mol %).

1. customReaction
2. customto flow at a rate of 4 ml/min into a glass tube
3. temperature(10 mm in diameter and 100 mm in length) that was heated at 90°-100° C
4. customThe unreacted acetone oxime was removed from the reaction solution by two extractions with 100 ml of ether
5. extractionThe resulting aqueous solution was subjected to two extractions with 100 ml of ether
6. dry with materialthe extract was dried with magnesium sulfate
7. distillationEther was distilled off under vacuum
8. distillationthe residue was distilled under vacuum

ORD record

ord-465117333a4042958e7b21ecd83df0a3

Source dataset

uspto-grants-1990_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04948916