5-amino-4-chloro-2-phenyl-3(2h)-pyridazinone free from...

Details 5-amino-4-chloro-2-phenyl-3(2h)-pyridazinone free from... 5-amino-4-chloro-2-phenyl-3(2h)-pyridazinone free from...

C - Chemistry, Metallurgy

07

D

260/264.7

C07D 237/20 (2006.01) A01N 43/58 (2006.01) C07D 237/22 (2006.01)

Patent

CA 1116169

ABSTRACT OF THE DISCLOSURE: The compound 5-amino-4-chloro-2-phenyl-3(2H)- pyridazinone free from 5-chloro-4-amino-2-phenyl-3(2H)- pyridazinone is used as selective weed-killer in a remarkably more efficacious and remarkably less phytotoxical way than the presently known " pyrazon" (mixture of 5-amino-4-chloro-2- phenyl-3(2H)-pyridazinone and 5-chloro-4-amino-2-phenyl-3(2H)- pyridazinone). The 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone is obtained from pyrazon by treating said pyrazon with a mineral acid of pre-fixed concentration, obtaining a suspension and filtering such a suspension. The use thereof as weed-killer is carried out in suitable formulations.

330303

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