GB224522A - Manufacture of b -2-oxybenzanthrone - Google Patents

Manufacture of b -2-oxybenzanthrone

Info

Publication number
GB224522A
GB224522A GB25597/24A GB2559724A GB224522A GB 224522 A GB224522 A GB 224522A GB 25597/24 A GB25597/24 A GB 25597/24A GB 2559724 A GB2559724 A GB 2559724A GB 224522 A GB224522 A GB 224522A
Authority
GB
United Kingdom
Prior art keywords
diazo
oxybenzanthrone
alkali
anhydride
benzanthrone
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
GB25597/24A
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.)
Hoechst AG
Original Assignee
Hoechst 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 Hoechst AG filed Critical Hoechst AG
Publication of GB224522A publication Critical patent/GB224522A/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
    • C09B3/02—Benzathrones
    • C09B3/06—Preparation from starting materials already containing the benzanthrone nucleus

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Coloring (AREA)

Abstract

Bz-21-Oxybenzanthrone is prepared from 11-diazo-21-oxybenzanthrone anhydride by replacing the diazo group by hydrogen. The diazo-oxy-anhydride may be obtained by nitrating 11-acetaminobenzanthrone, saponifying, and diazotizing; the benzanthrone-21-nitro-11-diazonium salt is then converted into the diazonium hydrate (either by hydrolysis or by removing the acid radicle by means of alkali sulphate, alkali acetate, bicarbonate &c.), whereupon the diazo-oxy-benzanthrone anhydride is formed, nitrous acid being eliminated. In an example 11-diazo-21-oxybenzanthrone anhydride is treated with stannous chloride and caustic potash solution; the 21-oxybenzanthrone obtained is purified by dissolving in alkali and reprecipitating; it yields with dimethylsulphate and alkali, a methoxy compound which, upon alkali fusion, forms a dyestuff dyeing cotton from the vat in green tints. Specification 218,255 is referred to.
GB25597/24A 1923-11-09 1924-10-27 Manufacture of b -2-oxybenzanthrone Expired GB224522A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE224522X 1923-11-09

Publications (1)

Publication Number Publication Date
GB224522A true GB224522A (en) 1925-11-26

Family

ID=5856383

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25597/24A Expired GB224522A (en) 1923-11-09 1924-10-27 Manufacture of b -2-oxybenzanthrone

Country Status (1)

Country Link
GB (1) GB224522A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6789277B2 (en) * 2000-06-02 2004-09-14 A. Robert Spitzer No drip bedpan

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6789277B2 (en) * 2000-06-02 2004-09-14 A. Robert Spitzer No drip bedpan

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