GB189923123A - Improvements in the Manufacture and Production of Indigo Leuco Compounds and other Indigo Products, and of Materials for use therein. - Google Patents
Improvements in the Manufacture and Production of Indigo Leuco Compounds and other Indigo Products, and of Materials for use therein.Info
- Publication number
- GB189923123A GB189923123A GB189923123DA GB189923123A GB 189923123 A GB189923123 A GB 189923123A GB 189923123D A GB189923123D A GB 189923123DA GB 189923123 A GB189923123 A GB 189923123A
- Authority
- GB
- United Kingdom
- Prior art keywords
- indigo
- sodium
- water
- phenylglycocoll
- formyl
- 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
Landscapes
- Indole Compounds (AREA)
Abstract
23,123. Johnson, J. Y., [Badische Anilin & Soda Fabrik]. Nov. 20. Formyl-, benzoyl-, and ethoxycarbonyl-phenylglycocoll-o-carboxylic esters are produced by heating phenylglycocoll-o-carboxylic dimethyl or diethyl ester with formic acid in a closed vessel, or with benzoylchloride or chloroformic ethyl ester on a water bath. The formyl and benzoyl derivatives are extracted from the mixture by ether. The ethoxycarbonyl derivative remains in an almost pure condition after washing the melt with dilute sodium-carbonate solution. It boils without decomposition above 360‹ C. Dyes, artificial.-The foregoing new acyl compounds are converted into indoxyl by boiling them with caustic alkali of about 20 per cent. strength with exclusion of air, or with caustic potash, milk of lime, or baryta water ; or by allowing them to stand with these reagents. The condensation is effected by metallic sodium, sodium alcoholate, ammonia, or hot sodium-carbonate solution. If fuming sulphuric acid containing 4 per cent. or more of sulphuric anhydride is used, the condensation is accompanied by oxidation and sulphonation, indigo sulphonic acid being formed. This is precipitated by addition of salt to a solution of the melt in water.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB189923123T | 1899-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB189923123A true GB189923123A (en) | 1900-11-20 |
Family
ID=32147460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB189923123D Expired GB189923123A (en) | 1899-11-20 | 1899-11-20 | Improvements in the Manufacture and Production of Indigo Leuco Compounds and other Indigo Products, and of Materials for use therein. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB189923123A (en) |
-
1899
- 1899-11-20 GB GB189923123D patent/GB189923123A/en not_active Expired
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