Process for obtaining 4,5-dichloro-2-phenyl-3(2h)-...

Details Process for obtaining 4,5-dichloro-2-phenyl-3(2h)-... Process for obtaining 4,5-dichloro-2-phenyl-3(2h)-...

C - Chemistry, Metallurgy

07

D

260/264.7

C07D 237/12 (2006.01) C07D 237/22 (2006.01) C07D 498/04 (2006.01)

Patent

CA 1119173

ABSTRACT OF THE DISCLOSURE: A process for obtaining 4,5-dichloro-2-phenyl- 3(2H)-pyridazinone from 5-chloro-4-amino-2-phenyl-3(2H)- pyridazinone. According to this process, 5-chloro-4-amino- 2-phenyl-3(2H) pyridazinone is first diazotized to give the following compound of formula (I): Image (I) This compound of formula (1) is then recovered by dilution with water and filtration. In a second stage, the so-recovered compound of formula (I) is reacted with thionyl chloride in accordance with the following reaction: Image (I) The resulting 4,5-dichloro-2-phenyl-3(2H)-pyridazinone is finally recovered by dilution with water and filtration.

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