Sulfuric Acid → Sulfuric Acid
Reaction equation
NC1SN=C2C=CC([N+:11]([O-:13])=[O:12])=CC=12.[S:14](=[O:18])(=[O:17])([OH:16])[OH:15]>>[S:14](=[O:16])(=[O:15])([OH:18])[OH:17].[N:11]([O:13][S:14](=[O:16])(=[O:15])[OH:17])=[O:12]Participants
Procedure
16.6 parts of 3-amino-5-nitro-2,1-benzisothiazole are introduced into 130 g of sulphuric acid (96% strength) at 25° C. After 90 minutes' stirring a clear solution has been obtained, to which 31 parts of 50% strength sulphuric acid and 25.8 parts of 42.5% strength nitrosylsulphuric acid are added at an interval of 30 minutes. After a further 30 minutes, the mixture is cooled to 5° C and a solution of 17.6 parts of N-ethyl-N-β-caboxyethyl-m-toluidine in 60 parts of glacial acetic acid is added dropwise at this temperature. After a further 30 minutes, the reaction mixture is poured out onto an ice-water mixture and this mixture is stirred for 4 hours. The dyestuff which has precipitated is filtered off, washed until the wash waters are neutral and then dried. The dyestuff of the formula ##SPC13##
Sources & evidence
- ORD record
- ord-adcbd8a1e2984e43acc897a4d20eda12
- Source dataset
- uspto-grants-1976_10
- Patent number
- US03985726
Reaction notes
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