Sodium Hydroxide → 2,6-dichloro-4-(trifluoromethyl)benzoic Acid

HRID 266529Notes

Reaction equation

HRID 266529 reaction equation
[OH-].[Na+].[Cl:3][C:4]1[CH:14]=[C:13]([C:15]([F:18])([F:17])[F:16])[CH:12]=[C:11]([Cl:19])[C:5]=1[C:6]([O:8]CC)=[O:7]>O.C(O)C>[Cl:3][C:4]1[CH:14]=[C:13]([C:15]([F:16])([F:17])[F:18])[CH:12]=[C:11]([Cl:19])[C:5]=1[C:6]([OH:8])=[O:7]

Participants

5

Reactant 2

HCID 14798Sodium HydroxideHCID 54315306Ethyl 2,6-dichloro-4-(trifluoromethyl)benzoate

Product 1

HCID 116804602,6-dichloro-4-(trifluoromethyl)benzoic AcidYield 71.7%

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 962WaterSolvent

Procedure

A solution of sodium hydroxide (41.6 g) in water was added to a solution of ethyl 2,6-dichloro-4-trifluoromethylbenzoate (96.3 g) in ethanol. The mixture was heated at reflux for 2.5 hours then cooled and evaporated. It was diluted with water and extracted with ether. The aqueous layer was acidified to pH1 and extracted with ether, washed with water, dried (Na2SO4) and filtered. The filtrate was evaporated to dryness and the residue was triturated with n-hexane and filtered to give 2.6-dichloro-4-trifluoromethylbenzoic acid (62.3 g) as a white solid mp 138.5°-139° C.

Workup

  1. temperatureThe mixture was heated
  2. temperatureat reflux for 2.5 hours
  3. temperaturethen cooled
  4. customevaporated
  5. additionIt was diluted with water
  6. extractionextracted with ether
  7. extractionextracted with ether
  8. washwashed with water
  9. dry with materialdried (Na2SO4)
  10. filtrationfiltered
  11. customThe filtrate was evaporated to dryness
  12. customthe residue was triturated with n-hexane
  13. filtrationfiltered

Sources & evidence

ORD record
ord-4ee7fd79a9ce40ee8d12ab6ada90b4f1
Source dataset
uspto-grants-1997_07
Patent number
US05650533

Reaction notes

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