GB405706A - Improvements in or relating to the manufacture of dibenzanthrone derivatives - Google Patents

Improvements in or relating to the manufacture of dibenzanthrone derivatives

Info

Publication number
GB405706A
GB405706A GB22816/32A GB2281632A GB405706A GB 405706 A GB405706 A GB 405706A GB 22816/32 A GB22816/32 A GB 22816/32A GB 2281632 A GB2281632 A GB 2281632A GB 405706 A GB405706 A GB 405706A
Authority
GB
United Kingdom
Prior art keywords
dibenzanthronyl
dyes
sulphuric acid
oxidation
class
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
GB22816/32A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries 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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of GB405706A publication Critical patent/GB405706A/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
    • C09B3/24—Preparation by synthesis of the nucleus
    • C09B3/26—Preparation by synthesis of the nucleus from dibenzanthronyls

Abstract

2 : 2<1>-Dibenzanthronyl is subjected to oxidation as in Specification 203,533, [Class 2 (iii), Dyes &c.], using manganese dioxide, and sulphuric acid of greater dilution, viz. 80--88 per cent, thus giving a purer product. The initial material may also be purified before the oxidation, by recrystallization. The sulphuric acid may be diluted by water, acetic acid or any other inert diluent. According to examples: (1) commercial 2 : 2<1>-dibenzanthronyl is oxidised with manganese dioxide and diluted sulphuric acid followed by filtering, treating with sodium bisulphite, and working up; (2) the recrystallized dibenzanthronyl is treated as in example (1); the products on alkylation according to Specification 193,431, [Class 2 (iii), Dyes &c.], give Jade Green dyes of high purity and great tinctorial strength.
GB22816/32A 1931-08-15 1932-08-15 Improvements in or relating to the manufacture of dibenzanthrone derivatives Expired GB405706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US405706XA 1931-08-15 1931-08-15

Publications (1)

Publication Number Publication Date
GB405706A true GB405706A (en) 1934-02-15

Family

ID=21911703

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22816/32A Expired GB405706A (en) 1931-08-15 1932-08-15 Improvements in or relating to the manufacture of dibenzanthrone derivatives

Country Status (1)

Country Link
GB (1) GB405706A (en)

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