SCHEDULED MAINTENANCE
Carbon suboxide and pyrazole led to the title system, the parent member of a group of cross-conjugated mesomeric betaines; with 3,5-dimethylpyrazole, the corresponding 5,7-dimethyl derivative was obtained, this being sufficiently stable for physical and chemical characterization.
K. T. Potts and P. Murphy, J. Chem. Soc., Chem. Commun., 1986, 144 DOI: 10.1039/C39860000144
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