Triclopyr

Triclopyr (3,5,6-Trichloro-2-pyridinyloxyacetic acid) is an organic compound in the pyridine group that is used as a systemic foliar herbicide[2] and fungicide.[3]

Triclopyr[1]
Names
IUPAC name
[(3,5,6-Trichloro-2-pyridinyl)oxy]acetic acid
Other names
Trident (Agriphar)
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.054.161
UNII
Properties
C7H4Cl3NO3
Molar mass 256.46
Appearance Fluffy solid
Melting point 148 to 150 °C (298 to 302 °F; 421 to 423 K)
440 mg/L
Solubility in acetone 989 g/kg
Acidity (pKa) 2.68
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Uses

Triclopyr is used to control broadleaf weeds while leaving grasses and conifers unaffected[2] or to control rust diseases on crops.[3]

Triclopyr is effective on woody plants and is used for brush control in the right of way and defoliation of wooded areas. In the USA it is sold under the trade names Garlon and Remedy, and in the UK as SBK Brushwood Killer.

It is also used for broadleaf weeds, particularly Creeping Charlie (Glechoma hederacea). It is sold under the trade names Turflon, Weed-B-Gon (purple label), and Brush-B-Gon ("Poison Ivy Killer") for these purposes. It is a major ingredient in Confront, which was withdrawn from most uses due to concerns about compost contamination from the other major ingredient, clopyralid.

Environmental effects

Triclopyr breaks down in soil with a half-life of between 30 and 90 days. Triclopyr degrades rapidly in water. It remains active in decaying vegetation for about 3 months.[4]

The compound is slightly toxic to ducks (LD50 = 1698 mg/kg) and quail (LD50 = 3000 mg/kg).[5] It has been found non-toxic to bees and very slightly toxic to fish (Rainbow trout LC50 (96 hrs.) = 117 ppm).[6]

gollark: I will NOT pass this "DÜRÜM"; I suspect it's a memetic hazard.
gollark: Berylliosis is no joke.
gollark: Yes, and I'm sure we're all aware of the possible dangers.
gollark: *You* are the class-15G apiohazard.
gollark: [DATA EXPUNGED] possible spontaneous human combustion, berylliosis, [REDACTED], similar to exposure to SCP-████.

References
  1. Merck Index, 11th Edition, 9572.
  2. Appleby, Arnold P.; Müller, Franz; Carpy, Serge (2001). "Weed Control". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a28_165. ISBN 3-527-30673-0.
  3. Shanmugasundaram, S.; Yeh, C.C.; Hartman, G.L.; Talekar, N.S. (1991). Vegetable Soybean Research Needs for Production and Quality Improvement (PDF). Taipei: Asian Vegetable Research and Development Center. pp. 86–87. ISBN 9789290580478. Retrieved 6 February 2016.
  4. Environmental Fate Of Triclopyr, Carissa Ganapathy, Environmental Monitoring & Pest Management Branch Department of Pesticide Regulation Sacramento, CA
  5. EXTOXNET (Extension Toxicology Network), Oregon State University
  6. Environmental Fate Of Triclopyr, Carissa Ganapathy, Environmental Monitoring & Pest Management Branch Department of Pesticide Regulation Sacramento, CA
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