Catalytic dehydrogenation preparation of 3-pyridazones

Details Catalytic dehydrogenation preparation of 3-pyridazones Catalytic dehydrogenation preparation of 3-pyridazones

1978-12-20

1981-03-10

Berch, Mark L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544240, 544241, C07D23714

Patent

active

042555710

ABSTRACT:
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.degree. 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.

REFERENCES:
patent: 3481987 (1969-12-01), Ennis et al.
Tisler et al., Adv. Het. Chem. 9, p. 221 (1960).
Chattergee et al., Tet. Letters 1969, 5223-5224.
Shamma et al., J. Organic Chem. 26, 2586-2587 (1961).

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