1,3,4-Oxadiazoles

Details 1,3,4-Oxadiazoles 1,3,4-Oxadiazoles

1979-02-01

1983-09-20

Higel, Floyd D.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

260157, 564149, C08K 523, C09B 3534

Patent

active

044057938

ABSTRACT:
2,5-Bis-(4'-aminophenyl)-1,3,4-oxadiazoles which are chlorinated in the phenyl nuclei are obtained by condensing hydrazine or a hydrazine yielding agent with equal or different chlorinated benzoic acids or acylating acid derivatives having in para-position to the acid group an amino group or a group capable of being transformed into the amino group, and, thereafter, effecting ring closure of the so-obtained bis-hydrazide to yield the oxadiazole. The products are bis-diazo components, especially for pigments having a very high tinctorial strength, clear and pure shades, a good fastness to light, to heat and to solvents.

REFERENCES:
patent: 2973358 (1961-02-01), Pugin

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