Add time:07/25/2019         Source:sciencedirect.com

The macrocyclic crown-formazans 7a-c, 12a-g were prepared by the azo coupling of the appropriate bis-diazonium salts 4a-c with pyruvic acid and arylpyruvic acids 8a-c. The ready accessability of the latters offers an easy access towards 1,5- symmetrically disubstituted-3-arylformazans e.g. 10a-g as well as their macrocyclic crown derivatives of expected valuable applications.

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