Water → 1-Acetyl-4-chloro-3-(3,5-dichlorophenyl)pyrazole

HRID 1586367Notes

Reaction equation

HRID 1586367 reaction equation
C(N(CC)CC)C.[Cl:8][C:9]1[C:10]([C:14]2[CH:19]=[C:18]([Cl:20])[CH:17]=[C:16]([Cl:21])[CH:15]=2)=[N:11][NH:12][CH:13]=1.[C:22](Cl)(=[O:24])[CH3:23].O>CN(C)C1C=CN=CC=1.C1COCC1>[C:22]([N:12]1[CH:13]=[C:9]([Cl:8])[C:10]([C:14]2[CH:15]=[C:16]([Cl:21])[CH:17]=[C:18]([Cl:20])[CH:19]=2)=[N:11]1)(=[O:24])[CH3:23]

Participants

7

Reactant 4

HCID 962WaterHCID 6367Acetyl chlorideHCID 8471TriethylamineHCID 178478181HCID 178478181, compound

Product 1

HCID 218526591-Acetyl-4-chloro-3-(3,5-dichlorophenyl)pyrazoleYield 96.7%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 8028TetrahydrofuranSolvent2×

Procedure

0.35 g (0.003 mol) of 4-dimethylaminopyridine and 1.55 ml (0.011 mol) of triethylamine are added to 2.55 g (0.01 mol) of 4-chloro-3-(3,5-dichlorophenyl)-pyrazole dissolved in 30 ml of THF. A solution of 0.85 g (0.011 mol) of acetyl chloride in 10 ml of THF is run, dropwise and at 0° C., onto this solution. Stirring is continued for 2 h at room temperature. The reaction mixture is poured into 100 ml of water and extracted with ethyl acetate. After drying the organic phase and concentration under vacuum, the residue is triturated with 50 ml of heptane, filtered and dried. We obtain 2.80 g of 1-acetyl-4-chloro-3-(3,5-dichlorophenyl)pyrazole, melting at 125° C.

Workup

  1. customat 0° C.
  2. extractionextracted with ethyl acetate
  3. customAfter drying
  4. concentrationthe organic phase and concentration under vacuum
  5. customthe residue is triturated with 50 ml of heptane
  6. filtrationfiltered
  7. customdried

Sources & evidence

ORD record
ord-b9e665cd2e424891badd17a2fe583bd7
Source dataset
uspto-grants-1999_08
Patent number
US05945382

Reaction notes

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