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Synlett 2000; 2000(6): 0809-0810
DOI: 10.1055/s-2000-6727
DOI: 10.1055/s-2000-6727
letter
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Selective N-Methylation of Pyrazolone with Methanol by Use of ZrO2 Catalyst in the Liquid Phase
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Publikationsverlauf
Publikationsdatum:
31. Dezember 2000 (online)
![](https://www.thieme-connect.de/media/synlett/200006/lookinside/thumbnails/10.1055-s-2000-6727-1.jpg)
Selective methylation of pyrazolone to 1-methylpyrazolone was investigated with ZrO2, which is a representative metal oxide with amphoteric character. The high selectivity up to ∼ 77% was obtained at 503 K. Mechanism is proposed in view of weak acidic-moderately basic pair sites of ZrO2.
pyrazolone - selective methylation - methanol - metal oxide catalyst