GB734841A - Improvements in the preparation of xanthene-9-carboxylic acid - Google Patents

Improvements in the preparation of xanthene-9-carboxylic acid

Info

Publication number
GB734841A
GB734841A GB763452A GB763452A GB734841A GB 734841 A GB734841 A GB 734841A GB 763452 A GB763452 A GB 763452A GB 763452 A GB763452 A GB 763452A GB 734841 A GB734841 A GB 734841A
Authority
GB
United Kingdom
Prior art keywords
acid
xanthene
carboxylic acid
cyanoxanthene
hydrolysed
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
GB763452A
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.)
Wellcome Foundation Ltd
Original Assignee
Wellcome Foundation 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 Wellcome Foundation Ltd filed Critical Wellcome Foundation Ltd
Priority to GB763452A priority Critical patent/GB734841A/en
Publication of GB734841A publication Critical patent/GB734841A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
    • C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D311/78—Ring systems having three or more relevant rings
    • C07D311/80—Dibenzopyrans; Hydrogenated dibenzopyrans
    • C07D311/82—Xanthenes
    • C07D311/84—Xanthenes with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 9

Landscapes

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

Abstract

Xanthene-9-carboxylic acid is prepared by heating xanthydrol with hydrogen cyanide in glacial acetic acid under pressure to form 9-cyanoxanthene which is then hydrolysed. The hydrogen cyanide may be formed by using sodium or potassium cyanide with the glacial acetic acid. Mineral acid may be added to the reaction mixture, e.g. sulphuric acid. The 9-cyanoxanthene may be isolated and purified before hydrolysis or may be hydrolysed as the crude reaction product. Acid or alkaline hydrolysis is referred to-alkaline hydrolysis in an alcoholic solution being preferred, e.g. with sodium or potassium hydroxide. Two detailed examples are given.
GB763452A 1952-03-25 1952-03-25 Improvements in the preparation of xanthene-9-carboxylic acid Expired GB734841A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB763452A GB734841A (en) 1952-03-25 1952-03-25 Improvements in the preparation of xanthene-9-carboxylic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB763452A GB734841A (en) 1952-03-25 1952-03-25 Improvements in the preparation of xanthene-9-carboxylic acid

Publications (1)

Publication Number Publication Date
GB734841A true GB734841A (en) 1955-08-10

Family

ID=9836875

Family Applications (1)

Application Number Title Priority Date Filing Date
GB763452A Expired GB734841A (en) 1952-03-25 1952-03-25 Improvements in the preparation of xanthene-9-carboxylic acid

Country Status (1)

Country Link
GB (1) GB734841A (en)

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