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nucleophile |
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nucleophileAtom or molecule that contains an electron pair available for bonding and in chemical reactions therefore seeks a positive centre, such as the nucleus of an atom or the positive end of a polar molecule (see covalent bond; electric dipole). In the Lewis electron theory (see acid-base theory), advanced by the U.S. chemist Gilbert Lewis (1875–1946) in 1923, nucleophiles are by definition Lewis bases. Examples include the hydroxide ion (OH−), the ions of the halogens chlorine, bromine, and iodine (Cl−, Br−, and I−, respectively), ammonia (NH3), and water (H2O). See also base; electrophile. nucleophile [′nü·klē·ə‚fīl] (physical chemistry) A species possessing one or more electron-rich sites, such as an unshared pair of electrons, the negative end of a polar bond, or pi electrons. Also known as electron donor. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Finally, the resulting polymer-bound metal sulfide completes the crosslink by nucleophilic attack on another polymer chain. From the cross-linking reaction mechanism of figure 1, it appears that the nucleophilic attack proceeds essentially in two steps, dehydrofluorination and subsequent addition. |
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