O-Xylene → 1-(4-Fluorophenyl)-4-oxocyclohexanecarbonitrile

HRID 1065262Notes

Reaction equation

HRID 1065262 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]#[N:10])=[CH:4][CH:3]=1.C[O-:12].[Na+].[CH3:14][C:15]1C=C[CH:18]=[CH:17][C:16]=1C>>[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2([C:9]#[N:10])[CH2:18][CH2:17][C:16](=[O:12])[CH2:15][CH2:14]2)=[CH:4][CH:3]=1

Participants

4

Reactant 3

HCID 7237O-XyleneHCID 68016Benzeneacetonitrile, 4-fluoro-HCID 10942334Sodium Methoxide

Product 1

HCID 918051-(4-Fluorophenyl)-4-oxocyclohexanecarbonitrile

Procedure

A mixture of 221 parts of 4-fluorobenzeneacetonitrile, 700 parts of sodium methoxide solution 30% and 900 parts of dimethylbenzene is stirred for 5 minutes. Then there are added dropwise 309 parts of methyl 2-propanoate (exothermic reaction: temperature rises to 65° C.). Upon completion, stirring is continued overnight at reflux temperature. The methanol is distilled off till an internal temperature of 110° C. is reached. After cooling, 1000 parts of a hydrochloric acid solution 6 N are added dropwise and the whole is stirred and refluxed for 5 minutes. Upon cooling, the layers are separated. The organic phase is dried, filtered and evaporated. The residue is stirred and refluxed for 4 hours together with 500 parts of acetic acid, 500 parts of water and 500 parts of a hydrochloric acid solution. After cooling, the product is extracted with trichloromethane. The extract is washed successively with water, with a diluted sodium hydroxide solution and again with water till neutralization, dried, filtered and evaporated. The residue is crystallized from 2-propanol, yielding 134.5 parts of 1-(4-fluorophenyl)-4-oxocyclohexanecarbonitrile; mp. 91.8° C.

Workup

  1. stirringUpon completion, stirring
  2. waitis continued overnight
  3. temperatureat reflux temperature
  4. distillationThe methanol is distilled off till an internal temperature of 110° C.
  5. temperatureAfter cooling
  6. addition1000 parts of a hydrochloric acid solution 6 N are added dropwise
  7. stirringthe whole is stirred
  8. temperaturerefluxed for 5 minutes
  9. temperatureUpon cooling
  10. customthe layers are separated
  11. customThe organic phase is dried
  12. filtrationfiltered
  13. customevaporated
  14. stirringThe residue is stirred
  15. temperaturerefluxed for 4 hours together with 500 parts of acetic acid, 500 parts of water and 500 parts of a hydrochloric acid solution
  16. temperatureAfter cooling
  17. extractionthe product is extracted with trichloromethane
  18. washThe extract is washed successively with water, with a diluted sodium hydroxide solution and again with water till neutralization,
  19. customdried
  20. filtrationfiltered
  21. customevaporated
  22. customThe residue is crystallized from 2-propanol

Sources & evidence

ORD record
ord-8d5d265155b242bb800df69ca407028f
Source dataset
uspto-grants-1982_05
Patent number
US04329353

Reaction notes

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