Hydrochloric Acid → 4H-1-Benzopyran-4-one, 5,7-dihydroxy-2-methyl-

HRID 2166990Notes

Reaction equation

HRID 2166990 reaction equation
C([O:4][C:5]1[CH:14]=[C:13]([O:15]C(=O)C)[CH:12]=[C:11]2[C:6]=1[C:7](=[O:23])[C:8](C(=O)C)=[C:9]([CH3:19])[O:10]2)(=O)C.Cl>C(=O)([O-])[O-].[Na+].[Na+]>[OH:4][C:5]1[CH:14]=[C:13]([OH:15])[CH:12]=[C:11]2[C:6]=1[C:7](=[O:23])[CH:8]=[C:9]([CH3:19])[O:10]2

Participants

4

Reactant 2

HCID 313Hydrochloric AcidHCID 13632741HCID 13632741, compound

Product 1

HCID 53752524H-1-Benzopyran-4-one, 5,7-dihydroxy-2-methyl-

Reagents, catalysts & solvents 1

HCID 10340Sodium CarbonateSolvent

Procedure

5,7-Diacetoxy-3-acetyl-2-methylchromen-4-one is refluxed for 1 hour with 40 ml of 10% sodium carbonate solution. After cooling, the suspension is adjusted to a pH of about 6 using 2N HCl and cooled. The precipitate is filtered off, giving 0.6 g of very pale brown powder (TM=279.9° C.)

Workup

  1. temperatureAfter cooling
  2. temperaturecooled
  3. filtrationThe precipitate is filtered off
  4. customgiving 0.6 g of very pale brown powder (TM=279.9° C.)

Sources & evidence

ORD record
ord-2716593bf189409da9964b77bc278336
Source dataset
uspto-grants-2015_06
Patent number
US09044409B2

Reaction notes

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