Protocatechuic Acid → Ethyl 3,4-Dihydroxybenzoate

HRID 1380592Notes

Reaction equation

HRID 1380592 reaction equation
[OH:1][C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][C:10]=1[OH:11])[C:5]([OH:7])=[O:6].[CH2:12](O)[CH3:13].OS(O)(=O)=O>O>[OH:1][C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][C:10]=1[OH:11])[C:5]([O:7][CH2:12][CH3:13])=[O:6]

Participants

5

Reactant 3

HCID 72Protocatechuic AcidHCID 702EthanolHCID 1118Sulfuric Acid

Product 1

HCID 77547Ethyl 3,4-DihydroxybenzoateYield 69%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture which contained 43 g (0.28 mole) of 3,4-dihydroxybenzoic acid, 300 ml of ethanol and 0.5 ml of concentrated H2SO4 was refluxed for 48 hours. Water was trapped with 3A molecular sieves. The reaction mixture was evaporated to dryness in vacuo, and partitioned between ether and 5% NaHCO3 solution. The ether layer was evaporated to give 39 g (69%) of solid; m.p. 128°-130° C. The NMR and IR spectra were consistent with the assigned structure.

Workup

  1. temperaturewas refluxed for 48 hours
  2. customThe reaction mixture was evaporated to dryness in vacuo
  3. custompartitioned between ether and 5% NaHCO3 solution
  4. customThe ether layer was evaporated

Sources & evidence

ORD record
ord-e0622b97a7464dbf8b29e8d8449e9ea2
Source dataset
uspto-grants-1986_04
Patent number
US04582855

Reaction notes

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