GB264503A - Improvements in the manufacture and production of alkylpyrazolanthrones - Google Patents

Improvements in the manufacture and production of alkylpyrazolanthrones

Info

Publication number
GB264503A
GB264503A GB961/27A GB96127A GB264503A GB 264503 A GB264503 A GB 264503A GB 961/27 A GB961/27 A GB 961/27A GB 96127 A GB96127 A GB 96127A GB 264503 A GB264503 A GB 264503A
Authority
GB
United Kingdom
Prior art keywords
sulphuric acid
pyrazoleanthrone
acid
methyl
pyrazoleanthrones
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
GB961/27A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB264503A publication Critical patent/GB264503A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
    • C07D231/54—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings condensed with carbocyclic rings or ring systems

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

264,503. I. G. Farbenindustrie Akt.- Ges. Jan. 13, 1926, [Convention date]. Alkylpyrazoleanthrones are obtained by treating pyrazoleanthrones with alkyl esters of sulphuric acid or arylsulphonic acids, or with mixtures of alcohol and sulphuric acid. in the presence of acid condensing agents. According to an example pyrazoleanthrone is treated with methyl or ethyl alcohol and sulphuric acid at 170‹ C. 5-Chlor-1 : 9-pyrazoleanthrone is also specified as parent material to he methylated. The methyl-and ethyl-pyrazoleanthrones so obtained yield red vat-dyes when fused with alcoholic potash according to the process of Specification 263,494. The Specification as open to inspection under Sect. 91 (3) (a.) comprises also examples in which pyrazoleanthrone is treated with sulphuric acid, boric acid and dimethylsulphate at 160‹ C., or with sulphuric acid, boric acid and toluenesulphonic methyl ester at 160‹ C. This subjectmatter does not appear in the Specification as accepted. 5-Chlor-1: 9-pyrazoleanthrone is obtained by heating equimolecular proportions of 1: 5-dichloranthraquinone and hydrazine hydrate in pyridine and condensing the resulting 5-chloranthraquinone-1-hvdrazine, e.g. by heating with a solution of aniline hydrochloride in aniline.
GB961/27A 1926-01-13 1927-01-12 Improvements in the manufacture and production of alkylpyrazolanthrones Expired GB264503A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE264503X 1926-01-13

Publications (1)

Publication Number Publication Date
GB264503A true GB264503A (en) 1928-04-12

Family

ID=5989784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB961/27A Expired GB264503A (en) 1926-01-13 1927-01-12 Improvements in the manufacture and production of alkylpyrazolanthrones

Country Status (1)

Country Link
GB (1) GB264503A (en)

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