TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

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... any of a class of chemical reactions in which an atom or a group of atoms in a molecule is replaced by another atom or group.  1, fiche 1, Anglais, - substitution%20reaction

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... an organic compound such as an alkyl halide can give rise to numerous types of organic compounds by substitution reactions with suitable reagents.  1, fiche 1, Anglais, - substitution%20reaction

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Substitution reactions are divided into ... general classes ... [such as] nucleophilic substitution ... [and] electrophilic substitution.  1, fiche 1, Anglais, - substitution%20reaction

Fiche 1,  Justifications,  Français

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Réaction au cours de laquelle un atome, dans une molécule, échange contre un autre atome un atome auquel il est lié, sans changer sa coordinence [...]  1, fiche 1, Français, - r%C3%A9action%20de%20substitution

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On distingue quatre types de réaction de substitution en chimie organique : 1. Les substitutions nucléophiles [...] 2. Les substitutions électrophiles [...] 3. Les substitutions radicalaires [...] 4. Les substitutions péricycliques.  1, fiche 1, Français, - r%C3%A9action%20de%20substitution

Fiche 1,  Justifications,  Espagnol

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Reemplazamiento de un átomo o radical por otro átomo o radical sin modificar la composición del resto de la molécula.  1, fiche 1, Espagnol, - substituci%C3%B3n

Fiche 2,  Justifications,  Anglais

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Chemical reaction in which one substituent (atom or group of atoms) in a compound is replaced by another substituent.  1, fiche 2, Anglais, - substitution%20reaction

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Specific acid-base catalysis by H⁺ or OH^- is of relatively limited importance in enzymatic reactions, but general acid-base catalysis is much more likely to be involved in the actions of enzymes. Many types of organic reactions occurring in cells -- the addition of water to carbonyl groups, the hydrolysis of carboxylic and phosphoric esters, the elimination of water to form double bonds, and many substitutions reactions -- are subject to this type of catalysis. Moreover, enzyme molecules are known to contain several kinds of functional groups capable of acting as general acids or general bases, e.g., amino, carboxyl, sulfhydryl, phenolic hydroxyl, and imidazole groups.  2, fiche 2, Anglais, - substitution%20reaction

Fiche 2,  Justifications,  Français

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Les principales réactions de la chimie organique sont conditionnées à la fois par les molécules qui les subissent et les réactifs chimiques qui les provoquent. (...) Dans ce contexte, les quatre grandes classes de mécanismes réactionnels en chimie organique se rassemblent dans les rubriques suivantes : - les réactions de substitution, - les réactions d'élimination, - les réactions d'addition, - les réactions radicalaires.  1, fiche 2, Français, - r%C3%A9action%20de%20substitution

Fiche 2,  Justifications,  Espagnol