GB243505A - Improvements in and relating to the production of dyestuff intermediates - Google Patents

Improvements in and relating to the production of dyestuff intermediates

Info

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
Application number
GB609124A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scottish Dyes Ltd
Original Assignee
Scottish Dyes Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Scottish Dyes Ltd filed Critical Scottish Dyes Ltd
Priority to GB609124A priority Critical patent/GB243505A/en
Publication of GB243505A publication Critical patent/GB243505A/en
Expired legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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.
GB609124A 1924-07-02 1924-07-02 Improvements in and relating to the production of dyestuff intermediates Expired GB243505A (en)

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)

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