Chloroform → HCID 13650572, compound

HRID 543416Notes

Reaction equation

HRID 543416 reaction equation
[CH2:1]([C:4]1[C:17]([OH:18])=[C:16]([Cl:19])[C:15]2[O:14][C:13]3[C:8](=[C:9]([Cl:20])[CH:10]=[CH:11][CH:12]=3)[C:7](=[O:21])[C:6]=2[CH:5]=1)[CH:2]=C.ClC1C=CC=C(C(OO)=O)C=1.C(Cl)(Cl)Cl.[C:37](=[O:40])([O-])[O-:38].[K+].[K+]>O>[Cl:20][C:9]1[C:8]2[C:7](=[O:21])[C:6]3[CH:5]=[C:4]4[CH2:1][CH:2]([C:37]([OH:38])=[O:40])[O:18][C:17]4=[C:16]([Cl:19])[C:15]=3[O:14][C:13]=2[CH:12]=[CH:11][CH:10]=1

Participants

6

Reactant 4

HCID 6212ChloroformHCID 11430Potassium CarbonateHCID 70297m-Chloroperbenzoic acidHCID 15617022HCID 15617022, compound

Product 1

HCID 13650572HCID 13650572, compoundYield 32.7%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture of 2-allyl-4,8-dichloro-3-hydroxy-9-oxo-9H-xanthene (14 g), m-chloroperbenzoic acid (11 g ) and chloroform (1,000 ml) was stirred at room temperature for 5 hours and thereafter left to stand overnight. To the mixture, potassium carbonate (20 g) and water (500 ml) were added and the resulting mixture was extracted with chloroform. The chloroform layer was dried and the solvent was distilled off. The residue was dissolved in acetone (2,000 ml) and to the stirred solution, a mixture of chromium trioxide (17 g), water (100 ml) and concentrated sulfuric acid (30 g) was added dropwise at room temperature. After standing overnight, the mixture was filtered and the filtrate was evaporated to dryness under vacuum. After addition of water, the solid crystal was recovered by filtration, washed with water and dried. Recrystallization from ethanol gave 5.0 g of 6,11-dichloro-2,3-dihydro-5-oxo-5H-furo[3,2-b]xanthene-2-carboxylic acid. m.p. 291°-294° C. This compound showed a mass spectrum having a molecular ion peak at m/e 350.

Workup

  1. waitleft
  2. waitto stand overnight
  3. extractionthe resulting mixture was extracted with chloroform
  4. dry with materialThe chloroform layer was dried
  5. distillationthe solvent was distilled off
  6. dissolutionThe residue was dissolved in acetone (2,000 ml) and to the stirred solution
  7. additiona mixture of chromium trioxide (17 g), water (100 ml) and concentrated sulfuric acid (30 g)
  8. additionwas added dropwise at room temperature
  9. waitAfter standing overnight
  10. filtrationthe mixture was filtered
  11. customthe filtrate was evaporated to dryness under vacuum
  12. additionAfter addition of water
  13. filtrationthe solid crystal was recovered by filtration
  14. washwashed with water
  15. customdried
  16. customRecrystallization from ethanol

Sources & evidence

ORD record
ord-253cda0593ea4fe68970f52e42022884
Source dataset
uspto-grants-1987_04
Patent number
US04661607

Reaction notes

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