5-Amino-4-chloro-2-phenyl-3(2H)-pyridazinone free from 5-chloro-

Details 5-Amino-4-chloro-2-phenyl-3(2H)-pyridazinone free from 5-chloro- 5-Amino-4-chloro-2-phenyl-3(2H)-pyridazinone free from 5-chloro-

1979-06-19

1981-08-25

Berch, Mark L.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

71 92, C07D23722

Patent

active

042860920

ABSTRACT:
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.

REFERENCES:
Reichenedir et al., Chem. Abs. 77, 126667f.

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