Process for obtaining 4,5-dichloro-2-phenyl-3(2H)-pyridazinone f

Details Process for obtaining 4,5-dichloro-2-phenyl-3(2H)-pyridazinone f Process for obtaining 4,5-dichloro-2-phenyl-3(2H)-pyridazinone f

1979-07-10

1980-12-02

Berch, Mark L.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544236, 544240, C07D23714, C07D23722, C07D49804

Patent

active

042372879

ABSTRACT:
In a process for obtaining 4,5-dichloro-2-phenyl-3(2H)-pyridazinone from 5-chloro-4-amino-2-phenyl-3(2H)-pyridazinone the 5-chloro-4-amino-2-phenyl-3(2H)-pyridazinone is diazotized in a first stage in accordance with the following reaction: ##STR1## the compound (I) being obtained by dilution with water and filtration. In a second stage of the process the compound (I) is reacted with thionyl chloride in accordance with the following reaction: ##STR2## the 4,5-dichloro-2-phenyl-3(2H)-pyridazinone being obtained by dilution with water and filtration.

REFERENCES:
Peters et al., J. Chem. Soc. 1943, 233.

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