PURIFICATION OF PHENYLAZOPYRAZOLE COMPOUND

PURPOSE:To provide a process for the purification of a phenylazopyrazole compound capable of producing an ultra-high purity product with a simple method. CONSTITUTION:A crude phenylazopyrazole compound of the formula (R1 and R2 are H, halogen, NO2, alkyl or alkoxy; R3 is H, OH or alkyl; R4 is H or a...

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Bibliographische Detailangaben
Hauptverfasser:	MATSUZAKI YORIAKI, TAKUMA HIROSUKE
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR APPARATUS THEREFOR CHEMISTRY CINEMATOGRAPHY ELECTROGRAPHY GENERAL METHODS OF ORGANIC CHEMISTRY HETEROCYCLIC COMPOUNDS HOLOGRAPHY MATERIALS THEREFOR METALLURGY ORGANIC CHEMISTRY ORIGINALS THEREFOR PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES PHYSICS
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Beschreibung
Zusammenfassung:	PURPOSE:To provide a process for the purification of a phenylazopyrazole compound capable of producing an ultra-high purity product with a simple method. CONSTITUTION:A crude phenylazopyrazole compound of the formula (R1 and R2 are H, halogen, NO2, alkyl or alkoxy; R3 is H, OH or alkyl; R4 is H or alkyl; R5 is alkyl or substituted or unsubstituted aryl) is dissolved in a water-soluble organic solvent (e.g. ketones, Cellosolves or amides) and crystallized by the addition of water in the presence of 1-30wt.%, preferably 3-20wt.% (based on the compound of the formula) of a chelating agent to obtain purified phenylazopyrazole compound. The chelating agent is e.g. ethylenediamine-N,N,N ',N'-tetraacetic acid and N-(hydroxyethyl)-ethylenediamine-N,N',N'-triacetic acid and is used preferably in a state dissolved or dispersed in water to be used in the process.