Potassium Carbonate → 4-(2-Acetoxy-ethoxy)-3-methylbenzaldehyde

HRID 2115213Notes

Reaction equation

HRID 2115213 reaction equation
[OH:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[O:7])=[CH:4][C:3]=1[CH3:10].C([O-])([O-])=O.[K+].[K+].[C:17]([O:20][CH2:21][CH2:22]Br)(=[O:19])[CH3:18]>CC(C)=O.C(OCC)C>[C:17]([O:20][CH2:21][CH2:22][O:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[O:7])=[CH:4][C:3]=1[CH3:10])(=[O:19])[CH3:18]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 135641-Acetoxy-2-bromoethaneHCID 1399014-Hydroxy-3-methylbenzaldehyde

Product 1

HCID 866118134-(2-Acetoxy-ethoxy)-3-methylbenzaldehydeYield 97.5%

Reagents, catalysts & solvents 2

HCID 180AcetoneSolventHCID 3283Diethyl EtherSolvent

Procedure

A mixture of 4-hydroxy-3-methyl-benzaldehyde (7.0 g, 51.4 mmol), K2CO3 (21.32 g, 154.2 mmol) and 2-bromoethyl acetate (25.8 g, 154.2 mmol) in acetone (250 mL) is refluxed for 18 h before it is diluted with diethyl ether (300 mL) and washed with water (3×250 mL). The washings are extracted with diethyl ether (200 mL). The combined organic extracts are dried over MgSO4 and concentrated. The remaining residue is purified by column chromatography on silica gel eluting with heptane/EA 1:1 to afford the title compound (11.14 g) as colourless solid. 1H NMR (CDCl3):δ 9.85 (s, 1H), 7.72-7.67 (m, 2H), 6.92-6.88 (m, 1H), 4.51-4.46 (m, 2H), 4.29-4.25 (m, 2H), 2.27 (s, 3H), 2.11 (s, 3H).

Workup

  1. temperatureis refluxed for 18 h before it
  2. washwashed with water (3×250 mL)
  3. extractionThe washings are extracted with diethyl ether (200 mL)
  4. dry with materialThe combined organic extracts are dried over MgSO4
  5. concentrationconcentrated
  6. customThe remaining residue is purified by column chromatography on silica gel eluting with heptane/EA 1:1

Sources & evidence

ORD record
ord-6a8e7da2c32d4b799c661ea5884e2480
Source dataset
uspto-grants-2008_10
Patent number
US07435828B2

Reaction notes

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