Fremgangsmåde til fremstilling af substituerede pyrazoler

Fremgangsmåde til fremstilling af substituerede pyrazoler

Pyrazole derivatives are prepared by reacting carbonyl compounds R1-C(O)-CH(R2)-CH2R3 with hydrazine, its hydrate or its salts in 30 to 100% by weight sulfuric acid in the presence of catalytic amounts of iodine or of an iodine compound.

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Bibliographische Detailangaben
Hauptverfasser: FRETSCHNER, ERICH, MERKLE, HANS RUPERT
Format: Patent
Sprache:dan
Schlagworte:
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Beschreibung
Zusammenfassung:Pyrazole derivatives are prepared by reacting carbonyl compounds R1-C(O)-CH(R2)-CH2R3 with hydrazine, its hydrate or its salts in 30 to 100% by weight sulfuric acid in the presence of catalytic amounts of iodine or of an iodine compound.