Formaldehyde → 2-(2-Chloro-6-nitrophenyl)ethanol

Temperatur

90 °C

Triton B (2 ml, 35% in MeOH) was added to a mixture composed of 2-chloro-6-nitrotoluene (25 g, 146 mmol) and paraformaldehyde (1.9 g, 60 mmol) in DMSO (20 ml, synthesis quality, additionally dried for 2 d over molecular sieve 4 Å) and was stirred at 90° C. After 2 h, the reaction mixture was neutralized with a few drops of conc. HCl, diluted with H2O (50 ml) and extracted with EtOAc (4×150 ml). The combined organic phases were dried over MgSO4, filtered and concentrated under reduced pressure. The crude product was purified by sublimation in a high vacuum (p=0.06 torr, oil bath temperature 95° C.). 2-(2-chloro-6-nitrophenyl)ethanol (8.01 g, 66%) was obtained in the form of bright yellow crystals.

1. custom20 ml, synthesis quality
2. customadditionally dried for 2 d over molecular sieve 4 Å) and
3. additiondiluted with H2O (50 ml)
4. extractionextracted with EtOAc (4×150 ml)
5. dry with materialThe combined organic phases were dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe crude product was purified by sublimation in a high vacuum (p=0.06 torr, oil bath temperature 95° C.)

ORD-Eintrag

ord-fc8d0a594b924d84aa2ef24d0c573823

Quelldatensatz

uspto-grants-1998_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05763599