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.
苯丙二酸二酰
肼与
2,4-戊二酮反应,出乎意料地得到5,7-二
甲基-1,3-二
氧杂-2-
苯基-2,3-二
氢-1 H-
吡唑并[1,2- a ]
吡唑- 4-yl5 。产物的结构通过X射线晶体学确认。