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Synthesis of pyrazolo[4′,3′:5,6]pyrido[1,2‐a]benzimidazole derivatives and study of their fluorescence properties
Author(s) -
Rajadhyaksha D. D.,
Rangnekar D. W.
Publication year - 1986
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280360703
Subject(s) - benzimidazole , hydrazine (antidepressant) , hydrate , fluorescence , chemistry , condensation , polyester , medicinal chemistry , organic chemistry , combinatorial chemistry , nuclear chemistry , chromatography , physics , quantum mechanics , thermodynamics
Synthesis of pyrazolo[4′,3′ :‐5,6′pyrido]1,2‐a benzimidazoles was achieved by the condensation of 1‐chloro‐2‐formyl‐3‐methyl pyrido[1,2‐a]benzimidazole‐4‐carbonitrile and 1‐chloro‐3‐methyl pyrido[1,2‐a]benzimidazole‐2,4‐dicarbonitrile with hydrazine hydrate and phenyl hydrazine. The fluorescence properties of the resulting compounds were studied. Some of the compounds when applied on polyester fibres as fluorescent brighteners gave excellent results.