1,3-Dibromo-5,5-dimethylhydantoin → 5-Bromo-2-methyl-3-nitrobenzoic acid

HRID 1616402Notes

Reaction equation

HRID 1616402 reaction equation
[CH3:1][C:2]1[C:10]([N+:11]([O-:13])=[O:12])=[CH:9][CH:8]=[CH:7][C:3]=1[C:4]([OH:6])=[O:5].[Br:14]N1C(C)(C)C(=O)N(Br)C1=O>OS(O)(=O)=O>[Br:14][C:8]1[CH:9]=[C:10]([N+:11]([O-:13])=[O:12])[C:2]([CH3:1])=[C:3]([CH:7]=1)[C:4]([OH:6])=[O:5]

Participants

4

Reactant 2

HCID 64791,3-Dibromo-5,5-dimethylhydantoinHCID 160962-Methyl-3-nitrobenzoic acid

Product 1

HCID 137700085-Bromo-2-methyl-3-nitrobenzoic acidYield 181.6%

Reagents, catalysts & solvents 1

HCID 1118Sulfuric AcidSolvent

Procedure

To stirred solution of 2-methyl-3-nitrobenzoic acid (50 g, 276.2 mmol) in conc. H2SO4 (200 mL), 1,3-dibromo-5,5-dimethyl-2,4-imidazolidinedione (43.4 g, 151.8 mmol) was added portionwise at room temperature and the reaction mixture stirred at room temperature for 5 h. The reaction mixture was poured into ice cold water; the solid which precipitated was filtered, washed with water and dried under vacuum giving the desired compound, 5-bromo-2-methyl-3-nitrobenzoic acid (71.7 g, 99.9%) which was used as is in further reactions.

Workup

  1. additionwas added portionwise at room temperature
  2. additionThe reaction mixture was poured into ice cold water
  3. customthe solid which precipitated
  4. filtrationwas filtered
  5. washwashed with water
  6. customdried under vacuum

Sources & evidence

ORD record
ord-57bcfeae227f44a1aca7a9175541e39a
Source dataset
uspto-grants-2014_07
Patent number
US08765732B2

Reaction notes

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