PRODUCTION OF TOBIAS ACID OF HIGH QUALITY

PURPOSE:To obtain the titled compound useful as an intermediate for dyes, etc., in high quality without forming by-products nor adding secondary treatment, e.g. purification, etc., by constituting at least a member in contact with a reaction solution of Ti or a Ti alloy. CONSTITUTION:At least a memb...

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Bibliographische Detailangaben
Hauptverfasser:	HOSOSUNA SHIGEMI, NAKAYAMA RIKITA
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY ORGANIC CHEMISTRY TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the titled compound useful as an intermediate for dyes, etc., in high quality without forming by-products nor adding secondary treatment, e.g. purification, etc., by constituting at least a member in contact with a reaction solution of Ti or a Ti alloy. CONSTITUTION:At least a member in contact with a reaction solution is constituted of Ti or a Ti alloy to give tobias acid of high quality. For example, the tobias acid is obtained by reacting a salt of Armstrong's acid expressed by formula II with NH3 in the presence of a catalyst in a reaction vessel according to the reaction formula to afford the aimed tobias acid expressed by formula I. In order to remarkably reduce the beta-naphthylamine content in the tobias acid, the reducing effect of a titanium vessel containing Pd is particularly great in the case of a titanium or titanium alloy reaction vessel used.