VERFAHREN ZUR HERSTELLUNG VON N.N'-BIS-SALICYLOYL-HYDRAZIN

The invention relates to a method for the production of N,N'-bis-salicyloyl hydrazine by a catalytic reaction of salicylic-acid alkyl esters with hydrazine or salicylic-acid hydrazide and has the object to develop such a method in such a manner that not only an N,N'-bis-salicyloyl hydrazin...

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Bibliographische Detailangaben
1. Verfasser:	V.,.GENTZKOW,WOLFGANG
Format:	Patent
Sprache:	ger
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS BASIC ELECTRIC ELEMENTS CABLES CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON CONDUCTORS ELECTRICITY INSULATORS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	The invention relates to a method for the production of N,N'-bis-salicyloyl hydrazine by a catalytic reaction of salicylic-acid alkyl esters with hydrazine or salicylic-acid hydrazide and has the object to develop such a method in such a manner that not only an N,N'-bis-salicyloyl hydrazine with reduced eye irritation is obtained, but wherein the product is also produced with a high yield and purity. For this purpose, the invention provides that hydrazine or salicylic-acid hydrazide is heated with a 1-to-10 times excess of salicylic-acid alkyl ester in the presence of a halogenide, hydroxide or oxide of boron, aluminum or zinc to temperatures of up to 150 DEG C. The N,N'-bis-salicyloyl hydrazine prepared by the method according to the invention is suitable particularly as an additive to polymers for cable and wire insulation in power and communication engineering.