GB243505A - Improvements in and relating to the production of dyestuff intermediates - Google Patents
Improvements in and relating to the production of dyestuff intermediatesInfo
- Publication number
- GB243505A GB243505A GB609124A GB609124A GB243505A GB 243505 A GB243505 A GB 243505A GB 609124 A GB609124 A GB 609124A GB 609124 A GB609124 A GB 609124A GB 243505 A GB243505 A GB 243505A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sulphuric acid
- acid
- amino
- solution
- nitro
- 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
Abstract
p-Substituted benzoylbenzoic acids are converted, by treatment with strong sulphuric acid or weak oleum, into the corresponding 2-substituted anthraquinone derivatives, which are nitrated in the same sulphuric acid solution without isolation. The crude products, which contain small quantities of oxy compounds, can be reduced with an alkaline reducing agent to the corresponding amino compounds, the oxy compounds remaining in the alkaline solution. According to an example, p-chlorbenzoylbenzoic acid (obtained from chlorbenzene and phthalic anhydride in presence of aluminium chloride) is heated with weak oleum and sodium nitrate-added; by pouring into water the nitro-2-chloranthraquinone is isolated and is then reduced by boiling with aqueous sodium sulphide solution; the product may be purified by dissolving in sulphuric acid and precipitating first the non-basic matter and then the amino compound by gradual dilution with water. Nitro- and amino-2-methylanthraquinones are similarly obtained from p-toluoylbenzoic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB609124A GB243505A (en) | 1924-07-02 | 1924-07-02 | Improvements in and relating to the production of dyestuff intermediates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB609124A GB243505A (en) | 1924-07-02 | 1924-07-02 | Improvements in and relating to the production of dyestuff intermediates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB243505A true GB243505A (en) | 1925-12-02 |
Family
ID=9808200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB609124A Expired GB243505A (en) | 1924-07-02 | 1924-07-02 | Improvements in and relating to the production of dyestuff intermediates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB243505A (en) |
-
1924
- 1924-07-02 GB GB609124A patent/GB243505A/en not_active Expired
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