Isovanillin → 2-Bromoisovanillin

HRID 131583Notes

Reaction equation

HRID 131583 reaction equation
[O:1]=[CH:2][C:3]1[CH:11]=[CH:10][C:7]([O:8][CH3:9])=[C:5]([OH:6])[CH:4]=1.C([O-])(=O)C.[Na+].[Br:17]Br.S(=O)(O)[O-].[Na+]>C(O)(=O)C.[Fe]>[Br:17][C:4]1[C:5]([OH:6])=[C:7]([O:8][CH3:9])[CH:10]=[CH:11][C:3]=1[CH:2]=[O:1]

Participants

7

Reactant 4

HCID 12127IsovanillinHCID 24408BromineHCID 517045Sodium AcetateHCID 23665763Sodium Bisulfite

Product 1

HCID 2240112-BromoisovanillinYield 45.9%

Reagents, catalysts & solvents 2

HCID 23925IronCatalystHCID 176Acetic AcidSolvent2×

Procedure

Isovanillin (5 gm, 0.033 mol) was dissolved in glacial acetic acid (30 ml). Anhydrous sodium acetate (5.4 gm) was added to the above solution followed by powdered iron (0.15 gm). The system was flushed thoroughly with nitrogen. A solution of bromine (5.79 gm, 0.0362 mol) in glacial acetic acid (10 ml) was added to the above stirred suspension at room temperature over a period of 15 min. The reaction mixture was stirred at room temperature for 45 min. The reaction mixture was poured into aqueous 2% sodium bisulfite (200 ml) and stirred for 10 min. The precipitate was filtered washed with water (100 ml), and dried to obtain 3.5 gm of 2-bromoisovanillin as white powder mp: (200-202° C.).

Workup

  1. customThe system was flushed thoroughly with nitrogen
  2. stirringstirred for 10 min
  3. filtrationThe precipitate was filtered
  4. washwashed with water (100 ml)
  5. customdried

Sources & evidence

ORD record
ord-f2e1fbe248db484b8c7d8ecf412b18b8
Source dataset
uspto-grants-2008_06
Patent number
US07384962B2

Reaction notes

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