MCPA

• 4-chloro -o- tolyloxyessigsäure
• 2-methyl -4- chlorophenoxyacetic acid
• MCPA

Yellowish crystalline powder with odor phenolartigem

Fixed

1.56 g · cm -3

Very slightly soluble in water (300 mg · l-1 at 25 ° C)

Risk

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

Template: Infobox chemical / molecular formula search available

MCPA or 2-methyl -4- chlorophenoxyacetic acid is a strong, selectively acting and widely used herbicide.

History

The synthesis of MCPA was published by Synerholme and Zimmerman in 1945 and by Templeman and Foster in 1946 and was the result of a selective herbicide to find a replacement for the 1- naphthalene acetic acid.

The synthesis of MCPA is carried out by a substitution reaction between chloroacetic acid and 4 -chloro-2 -methylphenol.

Chemical significance

Since MCPA is an inexpensive substance, it is used as a complex or as a building block for more complex agents.

Commercial importance

MCPA is generally used as a salt or as an ester as herbicide. It is used mainly against broad-leaved weeds such as thistles or docks used in agriculture. Although MCPA is non-toxic, so it turned out, however, that it increases the bioavailability of metal ions by complex formation.

Effect

MCPA auxin similar to and is an auxin herbicide so accelerates the growth of weeds, that enters the plant due to the resulting lower nutrient supply.

Brands

MCPA - containing products under the following brand names:

• Agritox
• Agroxone
• Banvel M
• Chiptox
• Chwastox
• Cornox
• Methoxone
• Rhonox
• Tigrex
• Verdone Extra ( GB)
• Weed- Rhap
• Weed'n'Feed
• Weed- B -Gone
• Zero bindii & Clover Weeder (Australia)
• U 46 M fluid