METHOD FOR THE PRODUCTION OF 2,6-DICHLORO-5-FLUORONICOTINONITRILE AND THE CHEMICAL COMPOUND 3-CYANO-2-HYDROXY-5-FLUOROPYRIDE-6-ONE-MONOSODIUM SALT AND ITS TAUTOMERS

摘要

The invention relates to 2,6-dichloro-5-fluoronicotinitrile which can beadvantageously obtained by reacting 3-cyano-2-hydroxy-5-fluoropyride-6-oneand/or its tautomers and/or its salts and/or their tautomers with phosphorustrichloride and chloric gas in a solvent with addition of a basic catalyst attemperatures between 30 and 300 ~C, and then by hydrolysis. The 3-cyano-2-hydroxy-5-fluoropyride-6-one-monosodium salt which can be used is a newchemical compound that is easy to obtain from 3-cyano-2-hydroxy-5-fluoropyride-6-one and/or its tautomers by reaction with alcoholate and precipitation witha moderately weak acid.