6-Hydroxynaphthalene-2-sulfonic acid → 2-Naphthol
Reaction equation
[Na].[CH:2]1[C:15]([OH:16])=[CH:14][C:5]2[CH:6]=[CH:7][C:8](S(O)(=O)=O)=[CH:9][C:4]=2[CH:3]=1>>[CH:14]1[C:5]2[C:4](=[CH:9][CH:8]=[CH:7][CH:6]=2)[CH:3]=[CH:2][C:15]=1[OH:16]Participants
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-0575524357454242913c6279481e63f3
- Source dataset
- uspto-grants-1976_11
- Patent number
- US03994963
Reaction notes
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