Syntheses of formazans under phase-transfer conditions
AA Katritzky, SA Belyakov, D Cheng, HD Durst
Index: Katritzky; Belyakov; Cheng; Durst Synthesis, 1995 , # 5 p. 577 - 581
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Citation Number: 39
Abstract
Several 1, 3, 5-triarylformazans were synthesized (42—77%) using a new methodology. Azo- coupling of aryldiazonium salts with arylaldehyde arylhydrazones under mild basic conditions in two-phase liquid-liquid media is efficiently promoted by phase-transfer catalysts (onium salts or dicyclohexano-18-crown-6) at 5-25 C'C. The condensation of benzaldehyde with phenylhydrazine followed by phase-transfer catalyzed azo-coupling ...
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