Das gelbe Isomere der (1,5‐Diphenylformazanyl)glyoxylsäure

Neugebauer, Franz A.; Fischer, Hans

doi:10.1002/cber.19791120443

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Das gelbe Isomere der (1,5‐Diphenylformazanyl)glyoxylsäure

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Neugebauer, Franz A.
Department of Organic Chemistry, Max Planck Institute for Medical Research, Max Planck Society;

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Fischer, Hans
Department of Organic Chemistry, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Neugebauer, F. A., & Fischer, H. (1979). Das gelbe Isomere der (1,5‐Diphenylformazanyl)glyoxylsäure. Chemische Berichte, 112(4), 1477-1479. doi:10.1002/cber.19791120443.

Cite as: https://hdl.handle.net/21.11116/0000-0003-AE8F-9

Abstract

The Yellow Isomer of (1,5‐Diphenylformazanyl)glyoxylic Acid

The yellow isomer is shown to be 4,4‐dihydroxy‐l‐phenyl‐3‐phenylazo‐2‐pyrazolin‐5‐one (3), the hydrate of the pyrazolin‐4,5‐dione 4. Treatment of 4 with a solution of potassium ‐tert‐ butoxide in dimethylsulfoxide leads to the formation of a radical anion identified as 5 by ESR.