Diquat

  • 6,7- Dihydrodipyrido [1,2-a: 2 ', 1' -c] pyraziniumdibromid (IUPAC - Name )
  • Ortho- Quat
  • 1,1 '- ethylene -2, 2'bipyridyldiyliumdibromid
  • 85-00-7
  • 2764-72-9 ( diquat ion )
  • 6385-62-2 ( Diquatbromidmonohydrat )

Colorless to pale yellow, flammable solid

Fixed

1.22 to 1.27 g · cm -3

325 ° C ( decomposition)

  • Well in water (718 g · l-1 at 20 ° C)
  • Insoluble in nonpolar solvents such as chloroform and diethyl ether, soluble in ethanol

Risk

230-440 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search available

Diquat dibromide is a heterocyclic organic compound from the class of bipyridines, which is used as a quick-acting contact herbicide. It is a colorless to pale yellow powder.

Production and representation

By oxidative coupling of pyridine over a Raney nickel catalyst, this is converted to 2,2 '-bipyridine. The ethylene bridge in diquat dibromide is then formed by 1,2- dibromoethane:

Use

Diquat dibromide is a 1957 by ICI ( now Syngenta ) introduced a contact herbicide, is used against weeds and acts by inhibiting photosynthesis. However, it is particularly suitable for killing potato vines before harvest ( desiccant ). The application of the compound is restricted to a few cases in Germany (potatoes, hops ). An application in nature reserves and national parks is prohibited ( the substance is considered to be particularly dangerous to bees and aquatic organisms).

Safety

Diquat dibromide is highly toxic.

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