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Unusual rearrangement in the reactions of phenylmalonic acid dihydrazide with 1, 3‐Diketones |
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| Authors: | Mahmoud Al‐Talib Hasan Tashtoush Areej Al‐Ghoul Burkhard Ziemer Ulrich Koert |
| Abstract: | Phenylmalonic acid dihydrazide reacted with 2,4‐pentanedione to give, unexpectedly, 5,7‐dimethyl‐1,3‐dioxo‐2‐phenyl‐2,3‐dihydro‐1H‐pyrazolo[1,2‐a]pyrazole‐4‐ylium 5. The structure of the product is confirmed by X‐ray crystallography. |
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