GB441041A - Manufacture of dyestuffs and intermediate products - Google Patents

Manufacture of dyestuffs and intermediate products

Info

Publication number
GB441041A
GB441041A GB8406/35A GB840635A GB441041A GB 441041 A GB441041 A GB 441041A GB 8406/35 A GB8406/35 A GB 8406/35A GB 840635 A GB840635 A GB 840635A GB 441041 A GB441041 A GB 441041A
Authority
GB
United Kingdom
Prior art keywords
methylbenzanthrone
brominated
sulphur
mixture
methyl
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
GB8406/35A
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.)
BASF Schweiz AG
Original Assignee
Gesellschaft fuer Chemische Industrie in Basel CIBA
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 Gesellschaft fuer Chemische Industrie in Basel CIBA filed Critical Gesellschaft fuer Chemische Industrie in Basel CIBA
Publication of GB441041A publication Critical patent/GB441041A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
    • C07C45/63—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by introduction of halogen; by substitution of halogen atoms by other halogen atoms

Abstract

Monobrominated methylbenzanthrones are obtained by brominating a methyl-benzanthrone containing the methyl group in 3, 6, or 7 position, or a mixture of such methyl benzanthrones, such as may be produced by removing the 2-methylbenzanthrone from the mixture produced in known manner from 2-methylanthraquinone. The bromination is preferably carried out in aqueous sulphuric acid at between 20 and 100 DEG C., the bromine entering the bz-1-position. The products may be converted into new vat dyestuffs by treating with alkaline condensing agents, or by treating the bromomethylbenzanthrone with a sulphur or selenium compound to convert it into sulphide or selenide, followed by condensation. The products may also be treated with a 1-aminoanthraquinone having a free 2-position, such as the 4- or 5-benzoylamino derivative, and then alkali-condensing. According to examples: (1) 6-methylbenzanthrone is brominated in sulphuric acid; (2) the methylbenzanthrone obtained according to Specification 133/10, [Class 2 (iii)], is brominated, condensed with 1-aminoanthraquinone, and the product further condensed with alcoholic potash a dye of olive shade is obtained after oxidation on vegetable fibre; (3) a methylbenzanthrone obtained from 2-methylanthraquinone is brominated, heated with sulphur, whereby a mixture of methylated bz<1>- and bz<1>1-dibenzanthronylsulphides is obtained, which is then further condensed with alcoholic potash; a blue to violet shade is obtained after oxidation on vegetable fibre; (4) cotton is dyed with the brominated methylbenzanthrone of example (1). Salts of sulphur or selenium are used to react with the brominated compound and may also be obtained in situ from xanthates, thiosulphates and hydrosulphites.
GB8406/35A 1934-03-17 1935-03-18 Manufacture of dyestuffs and intermediate products Expired GB441041A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH441041X 1934-03-17

Publications (1)

Publication Number Publication Date
GB441041A true GB441041A (en) 1936-01-10

Family

ID=4515197

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8406/35A Expired GB441041A (en) 1934-03-17 1935-03-18 Manufacture of dyestuffs and intermediate products

Country Status (1)

Country Link
GB (1) GB441041A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418318A (en) * 1944-03-23 1947-04-01 American Cyanamid Co Process for the preparation of bzi-chlorobenzanthrone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418318A (en) * 1944-03-23 1947-04-01 American Cyanamid Co Process for the preparation of bzi-chlorobenzanthrone

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