Diethyl (2,4-dichloro-3,6-difluorobenzoyl)-malonate → Ethyl (2,4-dichloro-3,6-difluorobenzoyl)acetate

HRID 974938

Reaction equation

HRID 974938 reaction equation
[Cl:1][C:2]1[C:20]([F:21])=[C:19]([Cl:22])[CH:18]=[C:17]([F:23])[C:3]=1[C:4]([CH:6](C(OCC)=O)[C:7]([O:9][CH2:10][CH3:11])=[O:8])=[O:5]>O>[Cl:1][C:2]1[C:20]([F:21])=[C:19]([Cl:22])[CH:18]=[C:17]([F:23])[C:3]=1[C:4]([CH2:6][C:7]([O:9][CH2:10][CH3:11])=[O:8])=[O:5]

Participants

3

Reactant 1

HCID 15070034Diethyl (2,4-dichloro-3,6-difluorobenzoyl)-malonate

Product 1

HCID 15070035Ethyl (2,4-dichloro-3,6-difluorobenzoyl)acetateYield 49.8%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

0.04 g of p-toluenetoluenesulphonic acid is added to an emulsion of 34.7 g of crude diethyl (2,4-di-chloro-3,6-difluorobenzoyl)-malonate in 40 ml of water. The mixture is heated at the boiling point for 3 hours, while stirring thoroughly, the cooled emulsion is extracted several times with methylene chloride, the combined CH2Cl2 solutions are washed once with saturated sodium chloride solution and dried with Na2SO4 and the solvent is distilled off in vacuo. Fractionation of the residue (33.9 g) in vacuo gives 13.9 g of ethyl (2,4-dichloro-3,6-difluorobenzoyl)-acetate of boiling point 110°-115° C./0.05 mbar, nD25 : 1,5241.

Workup

  1. temperatureThe mixture is heated at the boiling point for 3 hours
  2. extractionthe cooled emulsion is extracted several times with methylene chloride
  3. washthe combined CH2Cl2 solutions are washed once with saturated sodium chloride solution
  4. dry with materialdried with Na2SO4
  5. distillationthe solvent is distilled off in vacuo

Sources & evidence

ORD record
ord-166092886df9427db7977325063c8730
Source dataset
uspto-grants-1997_03
Patent number
US05607942

Linked notes

Loading…