2-Methylbenzenesulfonic acid → 4,5-Dichlorophthalic anhydride

HRID 480528

Reaktionsgleichung

Reaktionsgleichung von HRID 480528
[Cl:1][C:2]1[CH:3]=[C:4]([C:12]([OH:14])=[O:13])[C:5](=[CH:9][C:10]=1[Cl:11])[C:6]([OH:8])=O.C1(C)C(S(O)(=O)=O)=CC=CC=1>C1(C)C(C)=CC=CC=1>[Cl:11][C:10]1[CH:9]=[C:5]2[C:6](=[O:8])[O:14][C:12](=[O:13])[C:4]2=[CH:3][C:2]=1[Cl:1]

Komponenten

4

Edukt 2

HCID 69252-Methylbenzenesulfonic acidHCID 926004,5-Dichlorophthalic acid

Produkt 1

HCID 703344,5-Dichlorophthalic anhydrideAusbeute 89,9 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 7237O-XyleneLösungsmittel

Versuchsvorschrift

In a flask equipped with a stirrer, nitrogen inlet, and DEAN-STARK trap, 10.0 grams of 4,5-dichlorophthalic acid, 150 milliliters of xylene, and several crystals of toluenesulfonic acid were added. The mixture was heated to reflux and water was collected in the DEAN-STARK trap over a period often hours. The xylene was distilled off and the solid was collected in a BÜCHNER funnel and allowed to air dry, yielding 8.3 grams of 4,5-dichlorophthalic anhydride.

Aufarbeitung

  1. customIn a flask equipped with a stirrer, nitrogen inlet
  2. temperatureThe mixture was heated
  3. temperatureto reflux
  4. customwater was collected in the DEAN-STARK trap over a period often hours
  5. distillationThe xylene was distilled off
  6. customthe solid was collected in a BÜCHNER funnel
  7. customto air dry

Quellen und Nachweise

ORD-Eintrag
ord-d9b97a3b89b14b2e8638bf557f027858
Quelldatensatz
uspto-grants-2003_11
Patentnummer
US06652970B1

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