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ChemInform Abstract: A Direct One-Step Preparation of Triarylverdazylium Salts from the Corresponding Triarylformazans.

✍ Scribed by A. R. KATRITZKY; S. A. BELYAKOV

Publisher
John Wiley and Sons
Year
2010
Weight
29 KB
Volume
28
Category
Article
ISSN
0931-7597

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✦ Synopsis

A Direct One-Step Preparation of Triarylverdazylium Salts from the Corresponding Triarylformazans.

-Verdazylium salts such as (III), potential infrared absorbing dyes, are prepared by the reaction of formazanes (I) with formaldehyde and different organic or inorganic acids in a two-phase chloroform/water medium. Subsequent reduction of (III) in the same solvent system with ascorbic acid leads to formation of the corresponding radicals (IV), whereas reduction in methanol gives the leuco-verdazyl (V). -(KATRITZKY,

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