Gong Hong-lie
2011
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Hebei Chemical Industry
Abstract
3-Dichloropyridine is a very important chemical intermediate for synthesizing chlorantranihprole.To determine the synthetic methods of 2,3-dichlorpyridine,that is ,it is prepared with nicotinamide as raw material and through hofmann degradation,chlorination,diazotization and sandmeyer reaction starting with nicotinamide .To account the raw material cost of the synthetic method.The method is economic,reasonable and easy to industrialize.