2-Methyl-2-butene → 4-Benzyloxy-3-ethyl-5-methyl-benzoic acid

HRID 1958798Notes

Reaction equation

HRID 1958798 reaction equation
[CH2:1]([O:8][C:9]1[C:16]([CH3:17])=[CH:15][C:12]([CH:13]=[O:14])=[CH:11][C:10]=1[CH2:18][CH3:19])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CC(=CC)C.[O-:25]Cl=O.[Na+]>C(O)(C)(C)C.O.CC(OC)(C)C>[CH2:1]([O:8][C:9]1[C:16]([CH3:17])=[CH:15][C:12]([C:13]([OH:25])=[O:14])=[CH:11][C:10]=1[CH2:18][CH3:19])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

7

Reactant 3

HCID 105532-Methyl-2-buteneHCID 23668197Sodium ChloriteHCID 866393484-Benzyloxy-3-ethyl-5-methylbenzaldehyde

Product 1

HCID 594979194-Benzyloxy-3-ethyl-5-methyl-benzoic acid

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6386tert-ButanolSolventHCID 15413tert-Butyl methyl etherSolvent

Procedure

To a mixture of 4-benzyloxy-3-ethyl-5-methyl-benzaldehyde (132 g, 0.519 mol) and 2-methyl-2-butene (364 g, 5.19 mol) in tert-butanol (1500 mL), a solution of NaH2PO4 dihydrate (249 g, 2.08 mol) in water (1500 mL) is added. To this mixture, NaClO2 (187.8 g, 2.08 mol) is added in portions. The temperature of the reaction mixture is kept below 30° C., and evolution of gas is observed. Upon completion of the addition, the orange bi-phasic mixture is stirred well for 3 h before it is diluted with TBME (1500 mL). The org. layer is separated and washed with 20% aq. NaHS solution (1500 mL) and water (500 mL). The org. phase is then extracted 3 times with 0.5 N aq. NaOH (1000 mL), the aq. phase is acidified with 25% aq. HCl (500 mL) and extracted twice with TBME (1000 mL). These org. extracts are combined and evaporated to dryness to give 4-benzyloxy-3-ethyl-5-methyl-benzoic acid. 1H NMR (D6-DMSO): δ 1.17 (t, J=7.5 Hz, 3H), 2.31 (s, 3H), 2.67 (q, J=7.5 Hz, 2H), 4.86 (s, 2H), 7.34-7.53 (m, 5H), 7.68 (s, 2H), 12.70 (s, 1H).

Workup

  1. customis kept below 30° C.
  2. additionUpon completion of the addition
  3. customlayer is separated
  4. washwashed with 20% aq. NaHS solution (1500 mL) and water (500 mL)
  5. extractionphase is then extracted 3 times with 0.5 N aq. NaOH (1000 mL)
  6. extractionextracted twice with TBME (1000 mL)
  7. customevaporated to dryness

Sources & evidence

ORD record
ord-75eae56d269f4575ae2ef81f5b49b6c8
Source dataset
uspto-grants-2013_04
Patent number
US08410151B2

Reaction notes

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