PROCESS FOR THE PREPARATION OF 3-PYRIDAZONES

PROCESS FOR THE PREPARATION OF 3-PYRIDAZONES

PROCESS FOR THE PREPARATION OF 3-PYRIDAZONES of the disclosure: Pyridazones are prepared by heating 4,5-dihydro-3-pyridazones in the liquid phase in the presence of a dehydrogenation catalyst. The reaction temperature is in the range of from 150 to 350.degree.C. The dehydrogenation catalyst contains...

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Bibliographische Detailangaben
1. Verfasser: MUELLER, WERNER H
Format: Patent
Sprache:eng ; fre
Schlagworte:
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:PROCESS FOR THE PREPARATION OF 3-PYRIDAZONES of the disclosure: Pyridazones are prepared by heating 4,5-dihydro-3-pyridazones in the liquid phase in the presence of a dehydrogenation catalyst. The reaction temperature is in the range of from 150 to 350.degree.C. The dehydrogenation catalyst contains a noble metal of subgroup 8 of the periodic table, which is generally supported on a carrier. The reaction is preferably carried out in the presence of a solvent.