PRODUCTION OF 2,2'-DICHLOROHYDRAZOBENZENE

PURPOSE:To obtain a compound useful as an intermediate for 3,3'- dichlrorbenzidine synthesizing yellow organic pigment in high purity and in high yield, by reducing an azocy- or azobenzene derivative or a mixture thereof under specific condition. CONSTITUTION:2,2'-Dichloroaxocybenzene, 2,2...

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Bibliographische Detailangaben
Hauptverfasser:	TODA MINORU, TAO KATSUTOSHI, KIMOTO YUJI
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a compound useful as an intermediate for 3,3'- dichlrorbenzidine synthesizing yellow organic pigment in high purity and in high yield, by reducing an azocy- or azobenzene derivative or a mixture thereof under specific condition. CONSTITUTION:2,2'-Dichloroaxocybenzene, 2,2'-dixhloroazobenzene or a mixture of 2,2'-dichloroazoxybenaene and 2,2'-dichloroazobenzene is reduced with hydrazine hydrate to give the aimed substance. The reaction is carried to in water solvent in an alkali condition in the presence of a reduction promoter (e.g. 1,4-naphthoquinone), a surface active agent (e.g. sodium aliphatic alkylsulfonate) and Raney nickel catalyst or an alloy catalyst before development thereof at 30-60 deg.C. An alkali metal compound, alkali earth metal compound, ammonia or an organic basic compound is used as the alkalizing agent.