Nitric Acid → 2,4-Dichloro-5-fluoro-3-nitrobenzoic acid

HRID 729170

반응식

HRID 729170 반응식
[N+:1]([O-:4])(O)=[O:2].S(=O)(=O)(O)O.[Cl:10][C:11]1[CH:19]=[C:18]([Cl:20])[C:17]([F:21])=[CH:16][C:12]=1[C:13]([OH:15])=[O:14]>>[Cl:10][C:11]1[C:19]([N+:1]([O-:4])=[O:2])=[C:18]([Cl:20])[C:17]([F:21])=[CH:16][C:12]=1[C:13]([OH:15])=[O:14]

참가 물질

4

반응물 3

HCID 944Nitric AcidHCID 1118Sulfuric AcidHCID 6881382,4-Dichloro-5-fluorobenzoic acid

생성물 1

HCID 27342592,4-Dichloro-5-fluoro-3-nitrobenzoic acid

실험 절차

40 ml of concentrated nitric acid are added dropwise to 34 ml of concentrated sulphuric acid, while cooling with ice and stirring. 20.9 g of 2,4-dichloro-5-fluorobenzoic acid are introduced in portions into this nitrating mixture, whereupon the temperature rises to 45°-50° C. The mixture is then heated at 90°-100° C. for a further 3 hours, the mixture is cooled to room temperature and poured onto 350 ml of ice-water and the precipitate is filtered off with suction and washed with water. The moist crude product is dissolved in 30 ml of hot methanol and 150 ml of H2O are added to the solution. The precipitate is filtered off cold with suction, washed with CH3OH/H2O and dried in vacuo at 80° C. 21.2 g of crude 2,4-dichloro-5-fluoro-3-nitro-benzoic acid are obtained. It is sufficiently pure for further reactions. Melting point: 192° C. (from toluene/petroleum ether).

후처리

  1. temperaturewhile cooling with ice
  2. customrises to 45°-50° C
  3. temperatureThe mixture is then heated at 90°-100° C. for a further 3 hours
  4. filtrationthe precipitate is filtered off with suction
  5. washwashed with water
  6. dissolutionThe moist crude product is dissolved in 30 ml of hot methanol
  7. addition150 ml of H2O are added to the solution
  8. filtrationThe precipitate is filtered off cold with suction
  9. washwashed with CH3OH/H2O
  10. customdried in vacuo at 80° C

출처 및 근거

ORD 기록
ord-0da26aad1db64c0aa037c72a76b20f80
출처 데이터셋
uspto-grants-1991_09
특허 번호
US05051418

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