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31 de jul. de 2021 · Hammett's correlation covers chemical reactivity, spectroscopy and other physical properties, and even the biological activity of drugs. Virtually all quantitative treatments of reactivity of organic compounds in solution start with the kinds of correlations that are discussed in this section.
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In organic chemistry, the Hammett equation describes a linear free-energy relationship relating reaction rates and equilibrium constants for many reactions involving benzoic acid derivatives with meta- and para-substituents to each other with just two parameters: a substituent constant and a reaction constant.
The Curtin–Hammett principle applies to systems in which different products are formed from two substrates in equilibrium with one another. The rapidly interconverting reactants can have any relationship between themselves ( stereoisomers , constitutional isomers , conformational isomers, etc.).
The Hammett Equation One of the earliest examples of a LFER between: ¥the rate of base catalysed hydrolysis of a group of ethyl esters to form a series of carboxylic acids. ¥the equilibrium position of the ionisation in water of the corresponding group of acids. ¥Caveats: ÐOrtho isomers do not fall on the line. ÐAliphatic acids do not fall ...
The Hammett equation is the first attempt to give numerical values for the quantitative treatment of structure on reactivity. Hammett proposed the equation for the cases of m- and p-XC 6 H 4 Y as given below.
La ecuación de Hammett, en química orgánica, describe la relación lineal de energía libre relativa a la velocidad de reacción y la constante de equilibrio de varias reacciones que involucran a los derivados del ácido benzoico con sustituyentes meta- y para- entre sí con dos parámetros: una constante de sustituyente y una constante de reacción. 1...
The Curtin–Hammett principle in chemical kinetics was proposed by David Yarrow Curtin and Louis Plack Hammett to predict the relative ratio of the products obtained from a conformational equilibrium.
![Hammett diagram for the [ 125 I]-iodination (at 90°C) and [ 211 ...](https://cl.images.search.yahoo.com/search/images?p=hammett+diagram&ei=UTF-8&xargs=0&age=1d&fr=yhs-Elex-elex_22find&th=110.9&tw=110.9&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fprofile%2FFrancois-Guerard-3%2Fpublication%2F304005688%2Ffigure%2Ffig2%2FAS%3A614142276796416%401523434337322%2FHammett-diagram-for-the-125-I-iodination-at-90C-and-211-At-astatination-at_Q320.jpg&rurl=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FHammett-diagram-for-the-125-I-iodination-at-90C-and-211-At-astatination-at_fig2_304005688&size=14KB&name=Hammett+diagram+for+the+%5B+125+I%5D-iodination+%28at+90%C2%B0C%29+and+%5B+211+...&oid=2&h=320&w=320&turl=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.fCghcxReEcFh9VPzFFYXLwAAAA%26pid%3DApi%26rs%3D1%26c%3D1%26qlt%3D95%26w%3D110%26h%3D110&tt=Hammett+diagram+for+the+%5B+125+I%5D-iodination+%28at+90%C2%B0C%29+and+%5B+211+...&sigr=z6aifXGWO954&sigit=0uUphwApfBy1&sigi=enL4QHs1CctQ&sign=_BlZ5RaeWI2.&sigt=_BlZ5RaeWI2. "Hammett diagram for the [ 125 I]-iodination (at 90°C) and [ 211 ...")
![Hammett diagram for the [ 125 I]-iodination (at 90°C) and [ 211 ...](https://cl.images.search.yahoo.com/search/images?p=hammett+diagram&ei=UTF-8&xargs=0&age=1d&fr=yhs-Elex-elex_22find&th=110.9&tw=71.5&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F304005688%2Ffigure%2Ffig2%2FAS%3A614142276796416%401523434337322%2FHammett-diagram-for-the-125-I-iodination-at-90C-and-211-At-astatination-at.png&rurl=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FHammett-diagram-for-the-125-I-iodination-at-90C-and-211-At-astatination-at_fig2_304005688&size=114KB&name=Hammett+diagram+for+the+%5B+125+I%5D-iodination+%28at+90%C2%B0C%29+and+%5B+211+...&oid=3&h=1319&w=850&turl=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.H8ynzGR7wptHGYKiVj54ZAHaLf%26pid%3DApi%26rs%3D1%26c%3D1%26qlt%3D95%26w%3D71%26h%3D110&tt=Hammett+diagram+for+the+%5B+125+I%5D-iodination+%28at+90%C2%B0C%29+and+%5B+211+...&sigr=z6aifXGWO954&sigit=g49jqpjN1Ya_&sigi=cgry2yeZBmF.&sign=_BlZ5RaeWI2.&sigt=_BlZ5RaeWI2. "Hammett diagram for the [ 125 I]-iodination (at 90°C) and [ 211 ...")
