Phenylacetaldehyde → Phenylacetaldoxime

Phenylacetaldehyde (12.0 g, 7.8 ml, 0.1 mol) was dissolved in EtOH (360 ml) and mixed while stirring successively with hydroxylamine hydrochloride (10.4 g, 0.15 mol) and abs. pyridine (9.7 ml, 0.12 mol). After stirring for 1.5 h at RT, the reaction mixture was concentrated, the residue taken up in toluene (1×100 ml) and the solvent removed again under vacuum. The oily residue was stirred with EtOAc (350 ml) and water (90 ml) for 15 min. Subsequently, the phases were separated. The organic phase was washed with water (2×80 ml), dried and concentrated. The oil obtained crystallised after a short time. The oil was recrystallised from n-hexane (20 ml). Compound V was obtained as a white solid in a yield of 31% (4.13 g) having a melting point of 90-94° C.

1. additionmixed
2. concentrationthe reaction mixture was concentrated
3. customthe solvent removed again under vacuum
4. stirringThe oily residue was stirred with EtOAc (350 ml) and water (90 ml) for 15 min
5. customSubsequently, the phases were separated
6. washThe organic phase was washed with water (2×80 ml)
7. customdried
8. concentrationconcentrated
9. customThe oil obtained
10. customcrystallised after a short time
11. customThe oil was recrystallised from n-hexane (20 ml)

ORD record

ord-1f29426dda03432b98d282e44818ee9b

Source dataset

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08772307B2