Process for preparing ethalfluralin

Details Process for preparing ethalfluralin Process for preparing ethalfluralin

C - Chemistry, Metallurgy

07

C

C07C 211/52 (2006.01) C07C 209/84 (2006.01)

Patent

CA 2110329

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 wlth aqueous halogenhydric acid, wherein crude ethalfluralin is treated under agitation with an aqueous solution of hydrobromic acid in the presence of sulfamic acid and of a sulfur compound selected from the groups consisting of bisulfites, metabisulfites, hydrosulfites, sulfurous acid and gaseous sulfur dioxide.

Méthode pour préparer la dinitroaniline et l'éthalfluraline insaturées, renfermant une teneur en nitrosamines inférieure à 0,5 ppm et pratiquement exemptes du composé d'addition d'un acide halogénohydrique sur la double liaison méthallyle, par traitement à l'aide d'un acide halogénohydrique, où l'éthalfluraline est traitée par agitation avec une solution aqueuse d'acide bromhydrique en présence d'acide sulfamique et d'un composé sulfuré choisi parmi les groupes des bisulfites, des métabisulfites, des hydrosulfites, de l'acide sulfureux et du dioxyde de soufre gazeux

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