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Herbicides (US: / ˈ ɜːr b ɪ s aɪ d z /, UK: / ˈ h ɜːr-/), also commonly known as weed killers, are substances used to control undesired plants, also known as weeds. [1] Selective herbicides control specific weed species while leaving the desired crop relatively unharmed, while non-selective herbicides (sometimes called "total weed ...
2,4,5-Trichlorophenoxyacetic acid (also known as 2,4,5-T), a synthetic auxin, is a chlorophenoxy acetic acid herbicide used to defoliate broad-leafed plants. It was developed in the late 1940s, synthesized by reaction of 2,4,5-Trichlorophenol and chloroacetic acid.
In aqueous solution, it has a pK a value of 4.76. [21] Its conjugate base is acetate (CH 3 COO −). A 1.0 M solution (about the concentration of domestic vinegar) has a pH of 2.4, indicating that merely 0.4% of the acetic acid molecules are dissociated. [a] Cyclic dimer of acetic acid; dashed green lines represent hydrogen bonds
Dimethyl tetrachloroterephthalate (DCPA, with the main trade name Dacthal) is an organic compound with the formula C 6 Cl 4 (CO 2 CH 3) 2.It is the dimethyl ester of tetrachloroterephthalic acid, used as a preemergent herbicide with the ISO common name chlorthal-dimethyl.
It was recognized as toxic and was combined with large amounts of water or oil to function as a weed-killer. Army experiments with the chemical eventually led to the discovery that 2,4-D combined with 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) yielded a more potent herbicide. [ 1 ]
In March 2017, 40 plaintiffs filed a lawsuit at the Alameda County Superior Court, a branch of the California Superior Court, asking for damages caused by the company's glyphosate-based weed-killers, including Roundup, and demanding a jury trial. [243] On August 10, 2018, Monsanto lost the first decided case.
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