Process for preparing ethalfluralin

Details Process for preparing ethalfluralin Process for preparing ethalfluralin

1993-11-29

1995-04-11

Raymond, Richard L.

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

Organic compounds

Amino nitrogen containing

564112, 564406, 564441, C07C20984, C07C20990

Patent

active

054059992

ABSTRACT:
A process for the preparation of the unsaturated dinitroaniline, ethalfluralin having a level of nitrosamines lower than 0.5 ppm and essentially free from the compound of addition of halogenhydric acid on the methallyl double bond, by treatment with aqueous halogenhydric acid, wherein crude ethalfluralin is treated under agitation with an aqueous solution of hydrobromic acid in the presence of sulfamic acid and a sulfur compound selected from the group consisting of bisulfites, metabisulfites, hydrosulfites, sulfurous acid and gaseous sulfur dioxide.

REFERENCES:
patent: 4226789 (1980-10-01), Eizember et al.
patent: 4638090 (1987-01-01), Heinrich et al.
patent: 4874895 (1989-10-01), Graziello
patent: 4970343 (1990-11-01), Pikarski et al.
patent: 5196585 (1993-03-01), Wirth

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