Unusual rearrangement in the reactions of phenylmalonic acid dihydrazide with 1, 3-Diketones

✍ Scribed by Mahmoud Al-Talib; Hasan Tashtoush; Areej Al-Ghoul; Burkhard Ziemer; Ulrich Koert

• Publisher: Journal of Heterocyclic Chemistry
• Year: 2005
• Tongue: English
• Weight: 43 KB
• Volume: 42
• Category: Article
• ISSN: 0022-152X
• DOI: 10.1002/jhet.5570420217

✦ Synopsis

Phenylmalonic acid dihydrazide reacted with 2,4-pentanedione to give, unexpectedly, 5,7-dimethyl-1,3dioxo-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 .