Sulfuric Acid → 2,5-Dibromobenzene-1,4-dicarbaldehyde
Reaction equation
[Br:1][C:2]1[CH:7]=[C:6]([CH:8](OC(=O)C)[O:9]C(=O)C)[C:5]([Br:17])=[CH:4][C:3]=1[CH:18](OC(=O)C)[O:19]C(=O)C.S(=O)(=O)(O)O>C(O)C.O>[Br:1][C:2]1[CH:7]=[C:6]([CH:8]=[O:9])[C:5]([Br:17])=[CH:4][C:3]=1[CH:18]=[O:19]Participants
5
Reactant 2
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- -10 °C
Procedure
Unpurified 2,5-dibromo-α,α,α',α'-tetraacetoxy-1,4-xylene (60.5 g, 0.122 mole) was dissolved with stirring in three liters of hot ethanol. Then 450 ml of water was added followed by 75 ml of concentrated sulfuric acid which was added very slowly. After being allowed to reflux for an hour, the reaction mixture was diluted with 900 ml of hot water. Cooling overnight at -10° C. resulted in the recrystallization of 30.9 g (87% yield) of 2,5-dibromoterephthalaldehyde, mp 184°-189° C. (lit 189°-190.5° C.) which was isolated by filtration.
Workup
- additionwas added very slowly
- temperatureto reflux for an hour
Sources & evidence
- ORD record
- ord-a3ac255917f14e9590b1e52d0854c24b
- Source dataset
- uspto-grants-1988_06
- Patent number
- US04752642
Reaction notes
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