Method for producing N,N'-bis-salicyloyl hydrazine

Details Method for producing N,N'-bis-salicyloyl hydrazine Method for producing N,N'-bis-salicyloyl hydrazine

1981-08-18

1986-12-16

Hines, Robert V.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564136, 564139, 564148, 564150, C07C10320

Patent

active

046298126

ABSTRACT:
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.degree. 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.

REFERENCES:
patent: 2694072 (1954-11-01), Glahn et al.
patent: 2711415 (1955-06-01), Cottle et al.
patent: 2928875 (1960-03-01), Martin et al.
patent: 3081321 (1963-03-01), Young
patent: 4002680 (1977-01-01), Brunetti et al.

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