Oxalyl chloride → 4-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)benzoyl chloride

HRID 1034332Notes

Reaction equation

HRID 1034332 reaction equation
[C:1]([C:4]1[CH:9]=[CH:8][C:7]([N:10]2[C:14](=[O:15])[CH:13]=[CH:12][C:11]2=[O:16])=[CH:6][CH:5]=1)(O)=[O:2].C(Cl)(=O)C([Cl:20])=O>C1C=CC=CC=1>[C:14]1(=[O:15])[N:10]([C:7]2[CH:8]=[CH:9][C:4]([C:1]([Cl:20])=[O:2])=[CH:5][CH:6]=2)[C:11](=[O:16])[CH:12]=[CH:13]1

Participants

4

Reactant 2

HCID 65578Oxalyl chlorideHCID 869254-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)benzoic acid

Product 1

HCID 133654044-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)benzoyl chloride

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent

Procedure

Para-maleimidobenzoyl chloride was prepared in accordance with the procedure described by Adams et al. in J. Am. Chem. Soc., 42, 599 (1920). The N-(para-carboxyphenyl) maleimide (15 g) was suspended in about 80 ml of benzene with stirring. To this mixture was added 15 ml (a 2.5:1 molar excess) of oxalyl chloride, whereupon some gas was evolved. The mixture was then heated slowly to reflux and maintained at reflux for two hours. Excess oxalyl chloride was removed by distillation. The reaction mixture was then cooled and the yellow product recovered by suction filtration. The resultant product was washed with hexane and dried under vacuum at room temperature.

Workup

  1. additionTo this mixture was added 15 ml (a 2.5
  2. temperatureThe mixture was then heated slowly
  3. temperatureto reflux
  4. temperaturemaintained
  5. temperatureat reflux for two hours
  6. customExcess oxalyl chloride was removed by distillation
  7. temperatureThe reaction mixture was then cooled
  8. filtrationthe yellow product recovered by suction filtration
  9. washThe resultant product was washed with hexane
  10. customdried under vacuum at room temperature

Sources & evidence

ORD record
ord-4070919f56f64e2795aac29f46e169ad
Source dataset
uspto-grants-1994_05
Patent number
US05315011

Reaction notes

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