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In 1990 sulcotrione was introduced for post- emergence weed control in corn. Isoxaflutole opened the market more broadly for HPPD inhibitors when it was introduced in 1996 for corn and sugarcane, and for use as a pre-emergence herbicide that could control broadleaf weeds as did sulcotrione, but also additional grass weeds.
Quizalofop is a chlorophenxy and phenoxy herbicide that works by inhibition of acetyl-CoA-carboxylase to selectively control grasses, without affecting broadleaf crops. It may be shortened to QPE, from Quizalofop-P-Ethyl. [3] It is a Group 1 / A / A herbicide, used in Australia, [4] Morocco and Europe. [1]
A member of the cyclohexenones, a methyl ester, and an ether, alloxydim is a post-emergence herbicide. [2] Its sodium salt is a hygroscopic , water-soluble colorless solid. [ 3 ]
Ioxynil is a post-emergent [4] selective nitrile herbicide. It is used in Australia, New Zealand [5] and Japan [6] to control broadleaf weeds via the inhibition of photosynthesis. It is used notably on onion crops, [7] among others, normally at 300–900 g/Ha. [8] It was introduced in 1966.
As described in the BASF patent, the key step in the preparation of saflufenacil involved the reaction between a substituted aniline and an oxazinone. 2-chloro-4-fluoro-5-aminobenzoic acid and 2-dimethylamino-4-(trifluoromethyl)-6H-1,3-oxazin-6-one were heated in acetic acid to form the ring systems of the herbicide in over 90% yield, with further standard chemical transformations to generate ...
Post-emergent herbicides can be used more selectively, but also pose environmental risks, including toxicity to birds, bees, and mammals that consume or contact them.
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