METHOD FOR PREPARING TETRACHLORO-2-CYANOPYRIDINE Russian patent published in 2006 - IPC C07D213/84 C07D213/61 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention proposes a method for preparing 3,4,5,6-tetrachloro-2-cyanopyridine by interaction of 2-cyanopyridine with chlorine in the presence of phosphorus chlorides as a catalyst taken in the amount 2-60 weight % of the initial loads of 2-cyanopyridine. The chlorination process is carried out in the melt at temperature 120-200°C and under pressure up to 0.6 MPa. Method provides simplifying the process by using the standard equipment, improving ecological indices and decreasing energy consumptions.

EFFECT: improved preparing method.

3 cl, 8 ex