Sulfuric Acid → 1-Bromo-4-(2-nitroprop-1-en-1-yl)benzene

Temperatur

80 °C

A solution of 30.0 g (162 mmol) of 4-bromobenzaldehyde, 116 mL (1.6 mole) of nitroethane, and 37.5 g (486 mmol) of ammonium acetate in 200 mL of toluene was heated under a Dean and Stark trap for 18 hours. The mixture was then cooled to 80° C., 1 mL of concentrated sulfuric acid was added, and the mixture was stirred at 80° C. for 2 hours. The mixture was then cooled to ambient temperature and washed with 200 mL of brine. The organic layer was separated and the aqueous layer was extracted three times with 60 mL of diethyl ether. The combined organics were dried (MgSO4), filtered and coincentrated in vacuo. The residue was recrystallised from methanol to afford 18.7 g (47%) of the title compound.

1. temperatureThe mixture was then cooled to ambient temperature
2. washwashed with 200 mL of brine
3. customThe organic layer was separated
4. extractionthe aqueous layer was extracted three times with 60 mL of diethyl ether
5. dry with materialThe combined organics were dried (MgSO4)
6. filtrationfiltered
7. customThe residue was recrystallised from methanol

ORD-Eintrag

ord-5e22a7cef79d40049ff9617bc6f1f0a3

Quelldatensatz

uspto-grants-2006_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07135487B2