Process for preparing dihalopyridines

Process for preparing dihalopyridines

  • CN 104,662,003 A
  • Filed: 05/31/2013
  • Published: 05/27/2015
  • Est. Priority Date: 06/01/2012
  • Status: Active Application
First Claim
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1. the method for the manufacture of the compound of formula (A)(A) WhereinX 1and X 2be selected from Cl and Br independently of one another;

  • Y represents 0-3 and is selected from following substituting group independently of one another;

    halogen, CN, NO 2, OH, the alkyl be optionally substituted, the aryl be optionally substituted, and the heteroaryl be optionally substituted;

    With Wherein, described method comprises the steps (c);

    add first liquid mixture to second liquid mixture, and described first liquid mixture comprises metal sulphite, and described second liquid mixture comprises the compound of formula (B)(B),

    Haloid acid, and iron (III) compound.

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