Synthesis by Reversed Phase Transfer Catalysis and Characterization of Naphthol AS‐D Pigment | Zendy

Eleonora Crasmareanu | Zendy; Vasile Simulescu | Zendy; Gheorghe Ilia | Zendy

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Synthesis by Reversed Phase Transfer Catalysis and Characterization of Naphthol AS‐D Pigment

Author(s) -

Eleonora Crasmareanu,

Vasile Simulescu,

Gheorghe Ilia

Publication year - 2013

Publication title -

journal of chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.436

H-Index - 50

eISSN - 2090-9063

pISSN - 2090-9071

DOI - 10.1155/2013/545374

Subject(s) - chemistry , nitrobenzene , catalysis , phase (matter) , pigment , azo coupling , phase transfer catalyst , chloride , potassium , aqueous solution , organic synthesis , aqueous two phase system , organic chemistry , medicinal chemistry , combinatorial chemistry

Reversed phase transfer catalysis (RPTC) was applied to synthesize the Naphthol AS-D pigment. This method consists in the transfer of the aryldiazonium cation 4-nitrobenzenediazonium from aqueous medium into the organic phase (nitrobenzene) in the form of a lipophilic ions pair by the catalyst used (perfluorooctyl potassium sulfonates). In the organic phase the azo-coupling reaction between 4-nitrobenzenediazonium chloride and 3-hydroxy-2-carboxylic acid 2-methyl-anilide (Naphthol AS-D) takes place as coupling component. Using this unconventional method of synthesis, an increase of the reaction rate, combined with a higher purity of the product, was obtained

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