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Mesotrione is a selective herbicide used mainly in maize crops. [1] It is a synthetic compound inspired by the natural substance leptospermone found in the bottlebrush tree Callistemon citrinus . It inhibits the enzyme 4-hydroxyphenylpyruvate dioxygenase (HPPD) [ 3 ] and is sold under brand names including Callisto and Tenacity.
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In the mid-1980s, scientists at Stauffer Chemical Company published patents to benzoyl-substituted cyclohexanediones which led to their product mesotrione. [3] This encouraged workers at Rhône-Poulenc to expand their own research into molecules with the same mode of action as these 4-hydroxyphenylpyruvate dioxygenase inhibitors .
Leptospermone can be synthesized from phloroglucinol by a reaction with 3-methylbutanenitrile (isovaleronitrile) in the presence of a zinc chloride catalyst. . Phloroisovalerone imine is produced which is then alkylated with iodomethane after initial treatment with sodium ethoxide and methanol to produce an intermediate which is treated with aqueous hydrochloric acid resulting in ...
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Among its features, Dictionary.com offers a Word of the Day, [12] a crossword solver, [13] and a pop culture dictionary [14] that includes emoji and slang sections. In 2010, Dictionary.com began a Word of the Year feature with the word change. [15] The selection is based on search trends on the site throughout the year and the news events that ...
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Wiktionary is a free multilingual open-source wiki-based online dictionary. As of December 2024, Wiktionary articles have been created in 195 editions, with 171 currently active and 24 closed. As of December 2024, Wiktionary articles have been created in 195 editions, with 171 currently active and 24 closed.