Phosphoric Acid → Maltol
Reaction equation
Br[C:2]1[C:3](=[O:10])[CH:4]([CH3:9])[O:5][CH:6](O)[CH:7]=1.P(=O)(O)(O)[OH:12]>>[CH3:9][C:4]1[O:5][CH:6]=[CH:7][C:2](=[O:12])[C:3]=1[OH:10]Participants
3
Procedure
A solution of 4-bromo-6-hydroxy-2-methyl-2H-pyran-3(6H)-one (0.0025 mole) in 20 ml of 35% phosphoric acid was refluxed for about 5 hours. Maltol (34%) was isolated by the method of Example 1.
Sources & evidence
- ORD record
- ord-789a08dd972b4ebabbf1cd68f5b9406e
- Source dataset
- uspto-grants-1979_04
- Patent number
- US04147705
Reaction notes
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