4,5-Dichlorophthalic acid → 4,5-Dichlorophthalic anhydride

HRID 2165069Notes

Reaction equation

HRID 2165069 reaction equation
[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>C(OC(=O)C)(=O)C>[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]

Participants

3

Reactant 1

HCID 926004,5-Dichlorophthalic acid

Product 1

HCID 703344,5-Dichlorophthalic anhydride

Reagents, catalysts & solvents 1

HCID 7918Acetic AnhydrideSolvent

Procedure

A mixture of commercially available 4,5-dichlorophthalic acid (50.4 g) and acetic anhydride (150 ml) was refluxed for 2 hours. Upon cooling the precipitate product was collected and dried in vacuum (37.0 g; m.p. 180°-181° C.).

Workup

  1. temperaturewas refluxed for 2 hours
  2. temperatureUpon cooling the precipitate product
  3. customwas collected
  4. customdried in vacuum (37.0 g; m.p. 180°-181° C.)

Sources & evidence

ORD record
ord-3097dd1cbf8843a896329b617d4c307c
Source dataset
uspto-grants-1990_07
Patent number
US04939140

Reaction notes

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