GB619087A - Improvements in or relating to the decarboxylation of 1:3-dialkyl-pyridofluorenone-4-carboxylic acids - Google Patents

Improvements in or relating to the decarboxylation of 1:3-dialkyl-pyridofluorenone-4-carboxylic acids

Info

Publication number
GB619087A
GB619087A GB3416246A GB3416246A GB619087A GB 619087 A GB619087 A GB 619087A GB 3416246 A GB3416246 A GB 3416246A GB 3416246 A GB3416246 A GB 3416246A GB 619087 A GB619087 A GB 619087A
Authority
GB
United Kingdom
Prior art keywords
pyridofluorenone
acid
dialkyl
decarboxylation
pyridofluorenones
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
GB3416246A
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.)
THERAPEUTIC RES CORP OF GREAT
Original Assignee
THERAPEUTIC RES CORP OF GREAT
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 THERAPEUTIC RES CORP OF GREAT filed Critical THERAPEUTIC RES CORP OF GREAT
Priority to GB3416246A priority Critical patent/GB619087A/en
Publication of GB619087A publication Critical patent/GB619087A/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D221/00—Heterocyclic compounds containing six-membered rings having one nitrogen atom as the only ring hetero atom, not provided for by groups C07D211/00 - C07D219/00
    • C07D221/02—Heterocyclic compounds containing six-membered rings having one nitrogen atom as the only ring hetero atom, not provided for by groups C07D211/00 - C07D219/00 condensed with carbocyclic rings or ring systems
    • C07D221/04—Ortho- or peri-condensed ring systems
    • C07D221/06—Ring systems of three rings
    • C07D221/16—Ring systems of three rings containing carbocyclic rings other than six-membered

Landscapes

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

Abstract

1,3-Dialkyl-pyridofluorenones in which the alkyl groups do not contain more than six carbon atoms are obtained by heating the correspondingly substituted pyridofluorenone-4-carboxylic acid in an inert organic liquid at a temperature of 250-320 DEG C. to effect decarboxylation. Liquids specified are aliphatic or aromatic high boiling hydroxylic compounds, esters, bases or hydrocarbons such as liquid paraffin, glycerol and butyl phthalate. 300-320 DEG C. is the preferred temperature range. Acid salts of the pyridofluorenones are obtained on treatment with acid the isethionates being preferred. In examples: (1) 1,3-dimethyl-pyridofluorenone is obtained by heating 1,3-dimethyl-pyridofluorenone-4-carboxylic acid in liquid paraffin, and (2) the isethionate thereof obtained by treatment with isethionic acid.
GB3416246A 1946-11-18 1946-11-18 Improvements in or relating to the decarboxylation of 1:3-dialkyl-pyridofluorenone-4-carboxylic acids Expired GB619087A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3416246A GB619087A (en) 1946-11-18 1946-11-18 Improvements in or relating to the decarboxylation of 1:3-dialkyl-pyridofluorenone-4-carboxylic acids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3416246A GB619087A (en) 1946-11-18 1946-11-18 Improvements in or relating to the decarboxylation of 1:3-dialkyl-pyridofluorenone-4-carboxylic acids

Publications (1)

Publication Number Publication Date
GB619087A true GB619087A (en) 1949-03-03

Family

ID=10362163

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3416246A Expired GB619087A (en) 1946-11-18 1946-11-18 Improvements in or relating to the decarboxylation of 1:3-dialkyl-pyridofluorenone-4-carboxylic acids

Country Status (1)

Country Link
GB (1) GB619087A (en)

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