GB354974A - Improvements in anthraquinone vat dyes and a process of making the same - Google Patents

Improvements in anthraquinone vat dyes and a process of making the same

Info

Publication number
GB354974A
GB354974A GB21811/30A GB2181130A GB354974A GB 354974 A GB354974 A GB 354974A GB 21811/30 A GB21811/30 A GB 21811/30A GB 2181130 A GB2181130 A GB 2181130A GB 354974 A GB354974 A GB 354974A
Authority
GB
United Kingdom
Prior art keywords
brominated
product
sulphuric acid
dyes
soluble component
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
GB21811/30A
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.)
NEWPORT CO
Original Assignee
NEWPORT CO
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 NEWPORT CO filed Critical NEWPORT CO
Publication of GB354974A publication Critical patent/GB354974A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B3/00—Dyes with an anthracene nucleus condensed with one or more carbocyclic rings
    • C09B3/22—Dibenzanthrones; Isodibenzanthrones
    • C09B3/30—Preparation from starting materials already containing the dibenzanthrone or isodibenzanthrone nucleus
    • C09B3/32—Preparation from starting materials already containing the dibenzanthrone or isodibenzanthrone nucleus by halogenation

Landscapes

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

Abstract

Dibenzanthrones.-The brominated Bz2 : Bz21-dimethoxydibenzanthrones obtainable by the process of Specification 205,304, [Class 2 (iii), Dyes &c.], are separated into two components by treatment with sulphuric acid. The less soluble component, which appears to be a pure brominated Bz2 : Bz21-dimethoxydibenzanthrone dyes cotton in greenish shades decidedly more yellowish and more brilliant than those obtained from the composite product, while the more soluble component, which gives dull dyeings which are not fast to acid, appears to be brominated dihydroxydibenzanthrone formed by demethylation during the bromination process, and can be transformed to a product giving dyeings fast to acid by alkylation. The separation is preferably effected by fractional crystallization from concentrated sulphuric acid; alternatively, the more soluble component may be extracted from the composite product by treating with sulphuric acid of suitable strength. Examples are given of the treatment of the product of example 1 of Specification 205,304 and of commercial Indanthrene brilliant green 2G. In another example, Bz2 : Bz21-dimethoxydibenzanthrone, obtained as described in example B of Specification 181,304, [Class 2 (iii), Dyes &c.], is brominated in sulphuric acid monohydrate in the presence of iodine and the pure brominated product separated from the reaction liquid by dilution with water and addition of sodium bisulphite.
GB21811/30A 1929-08-08 1930-07-18 Improvements in anthraquinone vat dyes and a process of making the same Expired GB354974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US354974XA 1929-08-08 1929-08-08

Publications (1)

Publication Number Publication Date
GB354974A true GB354974A (en) 1931-08-20

Family

ID=21883071

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21811/30A Expired GB354974A (en) 1929-08-08 1930-07-18 Improvements in anthraquinone vat dyes and a process of making the same

Country Status (1)

Country Link
GB (1) GB354974A (en)

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