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Of 4-Bromo or 4-hydroxy pyrazol-3-ones

The hydroxyl group of 4-hydroxypyrazol-3-one 273 becomes a leaving group when [Pg.76]

Intermediate 274 is then attacked by dimethylamine to give 4-dimethylamino- [Pg.76]

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4- Bromo pyrazol-3-ones

Pyrazole hydroxy

Pyrazoles 3- hydroxy