76426-57-8Relevant academic research and scientific papers
A Facile Synthesis of 1-Oxo-1H-pyrazolopyrazol-4-ium-3-olates
Kappe, Thomas,Kos, Carlo
, p. 629 - 630 (1989)
The thermal condensation at 200-300 deg C of pyrazoles 1a-c with substituted diethyl malonates 2a-c or triethyl methanetricarboxylate 2d yields the 1-oxo-1H-pyrazolo-pyrazol-4-ium-3-olates 3a-h.
Mesoionic 4n ?-Heterocycles, I Mesoionic 4? Five-Membered Heterocycles and 8?-Heteropentalenes. Development of the Systems and Investigations on the 1-Oxo-1H-pyrazolopyrazol-4-ium-3-olate Type
Friedrichsen, Willy
, p. 1002 - 1008 (2007/10/02)
4n ?-Mesoionic heterocycles are - with one exception - a hitherto unknown class of compounds.In this paper the possible 4 ?-five-membered mesoionic heterocycles, their ring anellated derivatives and the corresponding heteropentalenes are derived.Reactions
