GB645061A - Improvements in or relating to methods of producing alpha-naphthoquinones, and the improved alpha-naphthoquinones resulting therefrom - Google Patents

Improvements in or relating to methods of producing alpha-naphthoquinones, and the improved alpha-naphthoquinones resulting therefrom

Info

Publication number
GB645061A
GB645061A GB19752/47A GB1975247A GB645061A GB 645061 A GB645061 A GB 645061A GB 19752/47 A GB19752/47 A GB 19752/47A GB 1975247 A GB1975247 A GB 1975247A GB 645061 A GB645061 A GB 645061A
Authority
GB
United Kingdom
Prior art keywords
naphthoquinones
acid
alpha
solvent
dimethyl
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
GB19752/47A
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.)
Velsicol Corp
Original Assignee
Velsicol Corp
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 Velsicol Corp filed Critical Velsicol Corp
Publication of GB645061A publication Critical patent/GB645061A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C50/00—Quinones
    • C07C50/10—Quinones the quinoid structure being part of a condensed ring system containing two rings

Landscapes

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

Abstract

Naphthalene and beta-substituted naphthalenes are oxidized to the corresponding 1 : 4-quinones in an inert solvent by intensive agitation with an aqueous solution of a hexavalent chromium compound in the presence of a mineral acid. The solvent is not attacked by the oxidizing agent and does not dissolve it; carbon tetrachloride and benzene are specified. The chromium compound is preferably sodium dichromate; chromic acid and potassium and ammonium dichromates are also mentioned. The acid is preferably sulphuric, in 60 to 77 weight per cent concentration, though other acids, e.g. phosphoric, may be used. The acid is run into a hot mixture of the other components and further heat applied to complete the reaction, agitation being maintained the whole time. The layers are then separated, the solvent distilled off and the quinone crystallized out. Examples show the preparation of a -naphthoquinone itself and also 2-methyl and 2 : 6-dimethyl-1 : 4-naphthoquinones; the 2 : 3-, 2 : 5-, 2 : 7- and 2 : 8-dimethyl-1 : 4-naphthoquinones are also mentioned.
GB19752/47A 1943-10-16 1947-07-23 Improvements in or relating to methods of producing alpha-naphthoquinones, and the improved alpha-naphthoquinones resulting therefrom Expired GB645061A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US645061XA 1943-10-16 1943-10-16

Publications (1)

Publication Number Publication Date
GB645061A true GB645061A (en) 1950-10-25

Family

ID=22056443

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19752/47A Expired GB645061A (en) 1943-10-16 1947-07-23 Improvements in or relating to methods of producing alpha-naphthoquinones, and the improved alpha-naphthoquinones resulting therefrom

Country Status (1)

Country Link
GB (1) GB645061A (en)

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