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Synthesis 1989; 1989(8): 629-630
DOI: 10.1055/s-1989-27341
DOI: 10.1055/s-1989-27341
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A Facile Synthesis of 1-Oxo-1H-pyrazolo[1,2-a]pyrazol-4-ium-3-olates
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Publication Date:
17 September 2002 (online)
The thermal condensation at 200-300°C of pyrazoles 1a-c with substituted diethyl malonates 2a-c or triethyl methanetricarboxylate 2d yields the 1-oxo-1H-pyrazolo-[1,2-α]pyrazol-4-ium-3-olates 3a-h.