Process for preparing 2,6-dicholoroquinoxaline

Details Process for preparing 2,6-dicholoroquinoxaline Process for preparing 2,6-dicholoroquinoxaline

C - Chemistry, Metallurgy

07

D

C07D 241/44 (2006.01) C07D 241/52 (2006.01)

Patent

CA 2064564

- 9 - HOE 89/F 249 Abstract of the disclosure Process for the preparation of 2,6-dichloroquinoxaline A process for the preparation of 2,6-dichloroquinoxaline by hydrogenating 6-chloro-2-hydroxyquinoxaline-N-oxide in aqueous sodium hydroxide solution in the presence of about 0.001 to about 0.5 mol percent of a platinum shell catalyst, relative to 6-chloro-2-hydroxyquinoxaline-N- oxide employed, at temperatures of about 20 to about 120°C at a hydrogen pressure of about 1 to about 100 bar, about 1 to about 3 equivalents of sodium hydroxide, relative to 6-chloro-2-hydroxyquinoxaline-N-oxide employed, being added, and after separating off the catalyst from the hot solution depositing the 6-chloro- 2-hydroxyquinoxaline dissolved therein in the form of the sodium salt as crystals by cooling the reaction solution to a temperature of about 0 to about 20°C, drying azao- tropically with an inert solvent and chlorinating using a chlorinating agent in a customary manner to give 2,6- dichloroquinoxaline.

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