Sulfuric Acid → 6-Hydroxynaphthalene-2-sulfonic acid
Reaction equation
[CH:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][C:2]=1[OH:11].[S:12](=O)(=[O:15])([OH:14])[OH:13]>>[CH:3]1[C:2]([OH:11])=[CH:1][C:10]2[CH:9]=[CH:8][C:7]([S:12]([OH:15])(=[O:14])=[O:13])=[CH:6][C:5]=2[CH:4]=1Participants
Procedure
Schaeffer's Salt is the common name for the sodium salt of 2-naphthol-6-sulfonic acid. As indicated, this product is obtained by sulfonation of 2-naphthol and forming the sodium salt of the intermediate 2-naphthol-6-sulfonic acid. In preparing Schaeffer's Salt, 2-naphthol is sulfonated directly with concentrated sulfuric acid at a temperature of about 100° C. under conditions such as to provide the maximum amount of 2-naphthol-6-sulfonic acid and follows conventional procedures. After the sulfonation is substantially complete, the resulting mixture is conventionally referred to as a sulfonation mixture. The sulfonation mixture will contain unreacted 2-naphthol, 2-naphthol-6-sulfonic acid, by-product 6,6'-oxybis(2-naphthalene sulfonic acid) and by-product 2-naphthol-3,6-disulfonic acid, with the major product being 2-naphthol-6-sulfonic acid. Preparation of the sulfonation mixture follows conventional procedure and forms no part of the present invention per se.
Sources & evidence
- ORD record
- ord-fdadc7ccfb004da1864995e65c9de7ce
- Source dataset
- uspto-grants-1976_11
- Patent number
- US03994963
Reaction notes
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