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
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