Sodium Hydroxide → HCID 14250980, compound

HRID 2291249Notes

Reaction equation

HRID 2291249 reaction equation
N[CH2:2][C:3]1[C:12]2[C:7](=[CH:8][C:9]([S:13]([OH:16])(=[O:15])=[O:14])=[CH:10][CH:11]=2)[CH:6]=[CH:5][CH:4]=1.[OH-:17].[Na+].[Cr](O[Cr]([O-])(=O)=O)([O-])(=O)=[O:20].[Na+].[Na+]>O>[C:2]([C:3]1[C:12]2[C:7](=[CH:8][C:9]([S:13]([OH:16])(=[O:15])=[O:14])=[CH:10][CH:11]=2)[CH:6]=[CH:5][CH:4]=1)([OH:20])=[O:17]

Participants

5

Reactant 3

HCID 14798Sodium HydroxideHCID 25408Sodium DichromateHCID 142509785-(Aminomethyl)naphthalene-2-sulfonic acid

Product 1

HCID 14250980HCID 14250980, compound

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
240 °C

Procedure

118.6 g (0.5 mol) of 1-aminomethylnaphthalene-6-sulphonic acid (100%) are stirred with 375 ml of water and about 50 g of 45% strength NaOH; the pH value of the mixture is brought to 7-7.5. After addition of 149 g of sodium dichromate (0.5 mol), the mixture is heated at 240° C. in an autoclave for 15 hours. After cooling, the green chromium hydroxide residue is filtered off and washed with hot water. The filtrate is acidified to pH 2 with hydrochloric acid (30% strength) under the influence of heat and then cooled to 20° C. The 1-carboxynaphthalene-6-sulphonic acid which precipitates out in the form of its sodium salt is filtered off and washed with 100 ml of saturated NaCl solution.

Workup

  1. temperatureAfter cooling
  2. filtrationthe green chromium hydroxide residue is filtered off
  3. washwashed with hot water
  4. temperatureof heat
  5. temperaturecooled to 20° C
  6. customThe 1-carboxynaphthalene-6-sulphonic acid which precipitates out in the form of its sodium salt
  7. filtrationis filtered off
  8. washwashed with 100 ml of saturated NaCl solution

Sources & evidence

ORD record
ord-f8369234fd404c18a7154ca9f05c067a
Source dataset
uspto-grants-1989_01
Patent number
US04795596

Reaction notes

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