Ethanol → Disodium 4-aminonaphthalene-2,6-disulphonate

HRID 66031Notes

Reaction equation

HRID 66031 reaction equation
[CH:1]1[C:10]2[C:5](=[C:6]([NH2:15])[CH:7]=[C:8]([S:11]([OH:14])(=[O:13])=[O:12])[CH:9]=2)[CH:4]=[C:3]([S:16]([OH:19])(=[O:18])=[O:17])[CH:2]=1.[OH-].[Na+:21].C(O)C>O>[Na+:21].[Na+:21].[NH2:15][C:6]1[C:5]2[C:10](=[CH:1][CH:2]=[C:3]([S:16]([O-:19])(=[O:18])=[O:17])[CH:4]=2)[CH:9]=[C:8]([S:11]([O-:14])(=[O:13])=[O:12])[CH:7]=1

Participants

5

Reactant 3

HCID 702EthanolHCID 14798Sodium HydroxideHCID 807094-Aminonaphthalene-2,6-disulphonic acid

Product 1

HCID 11970552Disodium 4-aminonaphthalene-2,6-disulphonate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A 45.0 g amount of (62.5%) 1-naphthylamine-3,7-disulfonic acid is suspended in 200 ml of water and 30 ml of 5N sodium hydroxide is added to it. The solution is warmed and absolute ethyl alcohol is added until a cloudy precipitate forms. The solution is cooled and the solid is collected by filtration and is washed with 85% ethyl alcohol, ethyl alcohol and ether. The product is dried in vacuo at 110° C. to give 21.0 g of 4-amino-2,6-naphthalenedisulfonic acid disodium salt.

Workup

  1. temperatureThe solution is warmed
  2. temperatureThe solution is cooled
  3. filtrationthe solid is collected by filtration
  4. washis washed with 85% ethyl alcohol, ethyl alcohol and ether
  5. customThe product is dried in vacuo at 110° C.

Sources & evidence

ORD record
ord-e8d7591b179948079dd526b56150fed8
Source dataset
uspto-grants-1978_12
Patent number
US04129590

Reaction notes

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