2,6-Naphthalenedisulfonic acid → 2,7-Naphthalenedisulfonic acid

HRID 2285671Notes

Reaction equation

HRID 2285671 reaction equation
[CH:1]1[C:10]2[C:5](=[CH:6][C:7](S(O)(=O)=O)=[CH:8][CH:9]=2)[CH:4]=[CH:3][C:2]=1[S:15]([OH:18])(=[O:17])=[O:16]>O>[CH:9]1[C:10]2[C:5](=[CH:4][CH:3]=[C:2]([S:15]([OH:18])(=[O:17])=[O:16])[CH:1]=2)[CH:6]=[CH:7][C:8]=1[S:15]([OH:18])(=[O:17])=[O:16]

Participants

3

Reactant 1

HCID 113902,6-Naphthalenedisulfonic acid

Product 1

HCID 667072,7-Naphthalenedisulfonic acid

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
23 °C

Procedure

To 520 g of the disulfonation reaction mixture obtained in Example 4 was added 180 ml of water to adjust the sulfuric acid concentration to 45% by weight. The mixture was cooled to 23° C. and the precipitated crystal was recovered by filtration to obtain 60 g of 2,7-naphthalenedisulfonic acid having a purity of 97%.

Workup

  1. concentrationthe sulfuric acid concentration to 45% by weight
  2. filtrationthe precipitated crystal was recovered by filtration

Sources & evidence

ORD record
ord-8273d9625dc94fbcbc5b250aff8a7a41
Source dataset
uspto-grants-1982_04
Patent number
US04324742

Reaction notes

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