Clopyralid

• 3,6- dichloropyridine - 2-carboxylic acid
• 3.6 dichloropicolinic

White crystalline solid

Fixed

152 ° C

Sparingly soluble in water (1 g · l-1 at 20 ° C)

Risk

• 4300 mg · kg -1 ( LD50, rat, oral)
• > 2000 mg · kg -1 ( LD50, Rabbit, transdermal)

Template: Infobox chemical / molecular formula search available

Clopyralid is chlorinated derivative of picolinic acid from the group of pyridine carboxylic acids. As a herbicide, the active ingredient under the trademark Lontrel is known.

Synthesis

The synthesis of clopyralid is based on 2 -picoline, which is chlorinated photochemically. Subsequently, the trichloromethyl group is substituted with nitric acid by a carboxyl group.

Use

Clopyralid is used as an active ingredient in pesticides. It is a systemic and selective auxin herbicide. Clopyralid has been included with effect from May 1, 2007 in the list of permitted in the EU pesticides.

In Germany, Austria and Switzerland pesticides are approved with this drug.