Salicylaldehyde → Salicylaldoxime

Temperature

95 °C

Into a 500 mL round bottom flask was placed a solution of 2-hydroxybenzaldehyde (20 g, 163.93 mmol) in ethanol (200 mL). To this was added (H2NOH HCl) hydroxylamine hydrochloride (14 g, 197.18 mmol). To the mixture was added triethylamine (19.2 g, 190.10 mmol) slowly. The resulting solution was allowed to react, with stirring, for 5 hours while the temperature was maintained at 95° C. in a bath of oil. The reaction progress was monitored by TLC (ethyl acetate/petroleum ether=1:2). The mixture was concentrated by evaporation. The resulting solution was extracted two times with 150 mL of ethyl acetate and water. The resulting mixture was washed 3 times with 150 mL of water. The mixture was dried over MgSO4 and concentrated by evaporator. The residue was purified by eluting through a column with a 1:100 ethyl acetate/petroleum ether solvent system. This resulted in 10 g (43%) of (E)-2-hydroxybenzaldehyde oxime as a white solid.

1. customInto a 500 mL round bottom flask was placed
2. customto react
3. concentrationThe mixture was concentrated by evaporation
4. extractionThe resulting solution was extracted two times with 150 mL of ethyl acetate and water
5. washThe resulting mixture was washed 3 times with 150 mL of water
6. dry with materialThe mixture was dried over MgSO4
7. concentrationconcentrated by evaporator
8. customThe residue was purified
9. washby eluting through a column with a 1:100 ethyl acetate/petroleum ether solvent system
10. customThis resulted in 10 g (43%) of (E)-2-hydroxybenzaldehyde oxime as a white solid

ORD record

ord-e0f2bfce51f341a98713ea5da3cd937a

Source dataset

uspto-grants-2010_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07696229B2