GB512618A - Process for the preparation of disazo dyestuffs - Google Patents
Process for the preparation of disazo dyestuffsInfo
- Publication number
- GB512618A GB512618A GB7107/38A GB710738A GB512618A GB 512618 A GB512618 A GB 512618A GB 7107/38 A GB7107/38 A GB 7107/38A GB 710738 A GB710738 A GB 710738A GB 512618 A GB512618 A GB 512618A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- amino
- sulphonic
- toluene
- sulphonic acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B35/00—Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling
- C09B35/02—Disazo dyes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Abstract
512,618. Dyes. CHEMICAL WORKS, FORMERLY. SANDOZ. March 7, 1938, No. 7107. Convention date, March 8, 1937. [Class 2 (iii)] Dyes for wool or hair are made by coupling one mol. of the tetrazo compound of 4.4<1>- diamino-diphenyl-3.3<1>-disulphonic acid or of 2.7-diamino-diphenylene-sulphonedisulphonic acid in an acid medium with two mols. of the same or different 2-amino-8-naphthol-6-sulphonic acids of the formula in which R is H, alkyl or an'aryl radicle substituted by alkyl radicles in at least the two vicinal positions, whereby the azo groups enter in o-position to the amino groups. The coupling components may be used in the form of their O-arylsulphonyl derivatives, the arylsulphonic radicles being subsequently split off. R may be vic-xylyl or mesidyl, and the coupling may be carried out in acid solution in presence of sodium formate, sodium acetate, chalk, magnesium carbonate, sulpho-cyanides, xanthogenates or thiosulphates. In examples, (1) benzidine-3.3<1>-disulphonic acid sodium salt is tetrazotised and coupled with 2-amino-8- hydroxynaphtholene-6-sulphonic acid, or its 0-toluene-sulphonyl derivative' followed by saponification (violet shades on wool or hair), or with 2-mesidylamino-8-hydroxynaphthalene- 6-sulphonic acid (blue shades) ; (2) 2.7 diaminodiphenylenesulphone-disulphonic acid is tetrazotised and coupled with 2-amino-8-hydroxygraph-thalene-6-sulphonic acid (blue shades). The O-toluene-sulphonyl derivative of 2 amino-8-hydroxy-naphthalene-6-sulphonic acid is obtained by treating an alkaline solution of 2 - acetylamino - 8 - hydroxy - naphthalene - 6- sulphonic acid with p-toluene-sulphonyl chloride, followed by boiling the product with dilute mineral acid. Specification 13743/96, [Class 2], is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH512618X | 1937-03-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB512618A true GB512618A (en) | 1939-09-21 |
Family
ID=4517527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7107/38A Expired GB512618A (en) | 1937-03-08 | 1938-03-07 | Process for the preparation of disazo dyestuffs |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB512618A (en) |
-
1938
- 1938-03-07 GB GB7107/38A patent/GB512618A/en not_active Expired
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