BE357270A - - Google Patents

Description

       

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  Production of 0-arbolic acids of carbazol "The oxycarboxylic acids of carbazol have not heretofore been described in the chemical literature.



   Now we have found that we can easily obtain by the action of carbonic acid on metal salts
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 alkaline doxyoarbazols or on o7, yea, azole in

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 presence of hydroxides or carbonates of alka-
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 linins, oxycarbr acids, carbazol ic5
The new oxycarboxylic acids of carbazol are valuable intermediates for the production of dyes.



   Example:
115 parts by weight of 2-oxycarbazol are finely pulverized with 350 parts by weight of potassium bicarbonate and introduced into an autoclave by adding glass beads. Carbonic acid is then introduced under pressure and the temperature is maintained at a temperature of 275 and at a pressure of 25 atm. for 20 hours.



  After which it is allowed to cool, the reaction product is taken up with water, filtered and the solution is made up.
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 acid tion. The 2-oxy-carbazol - o-carboxylic acid separates out as a faint yellow colored mass.



  This mass is filtered off, washed and dried. The crude product, melting at 266-267 C, consists of 2-isomers of
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 2-oxy-ca.rbazol- ortho-carboxylic acids-.



   The mixture can be separated by recrystallization from alcohol. From this we obtain a hardly soluble acid, in large prisms of a yellow color tending to green, which probably has the consti-
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 tution of a 2-oxy-carbazol-J-aarboxylic acid> melting /
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 at 273 - 274C't, liberating carbonic acid. he

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 gives a blue coloration with iron chloride, and the alkaline solution fluoresces purple.



  With diazo compounds it combines to form azo dyes. It does not form indophenol with para-nitroso-phenol in sulfuric acid solution. It is soluble in sulfuric acid with a yellow color. By acetylation, the corresponding acetylic acid is obtained, crystallizing from glacial acetic acid in needles, melting at 272 C. Orthoanisidide, prepared according to the usual methods, crystallizes in benzene or in. methyl alcohol. Lic in long prisms with a melting point of 204-206 C. The isomeric acid which probably has the structure of a 2-oxy-carbazol-1-carboxylic acid crystallizes from concentrated mother water. It melts at 271-272 C after recrystallization from xylene.



  The acid, having a pale yellow color, gives a blue color with chloride of iron; generally, its properties are very similar to those of - with isomeric acid. But in contrast to the acid mentioned above, 2-oxy-carbazol-1-carboxylic acid condenses with para-nitrophenol to give a blue indophenol in acidic solution. Ortho-anisidide crystallizes in xylene and has a melting point of 192-193 C.


    

Claims (1)

summary 10. A process for the production of the oxy-carboxylic acids of carbazol, consisting in reacting carbonic acid in the presence of alkali metal hydroxides or carbonates with oxycarbazols or with alkali metal salts of oxycarbazols. 2 - New products and their application in industry.