Process for the manufacture of 2,3-dichloropyridine

Details Process for the manufacture of 2,3-dichloropyridine Process for the manufacture of 2,3-dichloropyridine

C - Chemistry, Metallurgy

07

D

C07D 213/61 (2006.01) C07D 213/73 (2006.01) C07D 213/82 (2006.01)

Patent

CA 2553850

A method for preparing 2,3-dichloropyridine is disclosed in which 3-amino-2- chloropyridine is contacted with an alkali metal nitrite in the presence of aqueous hydrochloric acid to form a diazonium salt; and the diazonium salt is subsequently decomposed in the presence of copper catalyst wherein at least about 50% of the copper is the copper(II) oxidation state.

L'invention porte sur un procédé de préparation de 2,3-dichloropyridine dans lequel 3-amino-2-chloropyridine est mis en contact avec un nitrite métallique alcali en présence d'acide hydrochlorique aqueux afin de former un sel de diazonium ; puis le sel de diazonium est ensuite décomposé en présence de catalyseur de cuivre, au moins environ 50% du cuivre étant l'état d'oxydation du cuivre (II).

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