GB623114A - The production of 2-hydroxy-4-aminobenzoic acid - Google Patents
The production of 2-hydroxy-4-aminobenzoic acidInfo
- Publication number
- GB623114A GB623114A GB4596/47A GB459647A GB623114A GB 623114 A GB623114 A GB 623114A GB 4596/47 A GB4596/47 A GB 4596/47A GB 459647 A GB459647 A GB 459647A GB 623114 A GB623114 A GB 623114A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- hydroxy
- amino
- nitrobenzoic
- copper sulphate
- 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
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
2-Hydroxy-4-amino-benzoic acid is prepared by diazotizing 2-amino-4-nitrobenzoic acid by treating with nitrous acid in concentrated sulphuric acid with cooling, diluting the resultant solution with water and boiling in the presence of a copper salt (preferably copper sulphate) to form 2-hydroxy-4-nitrobenzoic acid, which is reduced to 2-hydroxy-4-amino-benzoic acid. Preferably, the boiling stage is carried out by pouring the diazotized solution into warm water in which copper sulphate is dissolved and heating rapidly to 110 DEG to 120 DEG C. In an example, 2-amino-4-nitrobenzoic acid is dissolved in sulphuric acid, treated with sodium nitrite, the resultant solution is poured into warm copper sulphate solution and is boiled, giving 2-hydroxy-4-nitrobenzoic acid which is reduced to 2-hydroxy-4-aminobenzoic acid by treating with hydrogen in alcohol in the presence of platinum oxide or by means of tin and concentrated hydrochloric acid. The Specification as open to inspection under Sect. 91 comprises also the preparation of derivatives of 2-hydroxy-4-amino-benzoic acid such as 2-hydroxy-3-methyl-4-aminobenzoic acid, 4-hydroxy-6-aminoisophthalic acid and 2-amino-4-nitro-x-sulphobenzoic acid by the process described above. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE623114X | 1945-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB623114A true GB623114A (en) | 1949-05-12 |
Family
ID=20313313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4596/47A Expired GB623114A (en) | 1945-12-07 | 1947-02-17 | The production of 2-hydroxy-4-aminobenzoic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB623114A (en) |
-
1947
- 1947-02-17 GB GB4596/47A patent/GB623114A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB361820A (en) | Manufacture of aqueous solutions of silk fibroin | |
| GB623114A (en) | The production of 2-hydroxy-4-aminobenzoic acid | |
| GB483773A (en) | Improved method of treating starch | |
| GB641173A (en) | A method for the production of basic substances for ion exchangers | |
| GB623488A (en) | A process for the manufacture of 2-carboxymethylmercapto-benzene stibonic acid | |
| GB441919A (en) | Improvements in the manufacture and production of nitrodibenzanthrones | |
| GB570365A (en) | Process for the manufacture of adermine | |
| SU68438A1 (en) | The method of obtaining chrome tanning extract | |
| GB456544A (en) | Method of making titanium dioxide | |
| GB419954A (en) | Process for the manufacture of 1.4-diamino-anthraquinone-2.3.x-trisulphonic acids | |
| GB488274A (en) | Improvements in insoluble coloured products or pigments and process for manufacturing the same | |
| GB619507A (en) | Improvements in and relating to the manufacture of products adapted for use in colour photography and of photographic images in colour | |
| NL32365C (en) | ||
| GB355464A (en) | ||
| GB343449A (en) | Improvements in and relating to the production of anthraquinone derivatives | |
| GB219283A (en) | Process of manufacture of articles from woven goods | |
| GB513867A (en) | Improvements in the hydrolytic precipitation of titanium compounds and in the manufacture of titanium pigments | |
| GB457518A (en) | Process for the manufacture of 2.4-dinitro-3:6-dihalogenanilines | |
| GB462681A (en) | Manufacture of sulphonic acids of 5-hydroxy-acenaphthene | |
| GB410153A (en) | Improvements in or relating to the manufacture of solutions of cellulose derivatives or conversion products | |
| GB668924A (en) | 3-trifluoromethyl-4-chlorophenol and the preparation thereof | |
| GB565616A (en) | Process for the manufacture of indazolones | |
| GB466196A (en) | Improvements in or relating to cotton material and processes of making the same | |
| GB815377A (en) | Improvements in or relating to the production of beer malt | |
| GB623217A (en) | Improvements in or relating to 2-methyl-4-chloro-phenoxyacetic acid |