Reaktionsgleichung
[N+:1]([C:4]1[CH:12]=[C:11]([C:13]([OH:15])=[O:14])[CH:10]=[CH:9][C:5]=1[C:6]([OH:8])=[O:7])([O-:3])=[O:2].S(=O)(=O)(O)O.[CH3:21]O>>[CH3:21][O:14][C:13]([C:11]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=[O:7])=[C:4]([N+:1]([O-:3])=[O:2])[CH:12]=1)=[O:15]Komponenten
Versuchsvorschrift
A mixture of nitroterephthalic acid (Aldrich, 20 g, 0.095 mol) in anhydrous methanol (100 mL) was heated to reflux in the presence of concentrated sulphuric acid (10 mL) for 1 h. The solvent was evaporated and the residue poured into saturated sodium bicarbonate (200 mL). The aqueous layer was washed with chloroform and 2N hydrochloric acid added to the aqueous layer to bring the pH close to 2. The mixture was extracted twice with ethyl acetate and the combined organic layers were washed with water and brine. The organic extract was concentrated after drying over sodium sulphate and the residue was recrystallized from ethyl acetate-hexane to give 11.8 g (55%) of 4-methoxycarbonyl-2-nitrobenzoic acid as cream-colored crystals, mp 131°-132° C.
Aufarbeitung
- temperaturewas heated
- customThe solvent was evaporated
- additionthe residue poured into saturated sodium bicarbonate (200 mL)
- washThe aqueous layer was washed with chloroform and 2N hydrochloric acid
- additionadded to the aqueous layer
- customclose to 2
- extractionThe mixture was extracted twice with ethyl acetate
- washthe combined organic layers were washed with water and brine
- extractionThe organic extract
- concentrationwas concentrated
- dry with materialafter drying over sodium sulphate
- customthe residue was recrystallized from ethyl acetate-hexane
Quellen und Nachweise
- ORD-Eintrag
- ord-15bbe074cb3942beb3690da0d7287911
- Quelldatensatz
- uspto-grants-1997_02
- Patentnummer
- US05602277
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