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  2. SN1 reaction - Wikipedia

    en.wikipedia.org/wiki/SN1_reaction

    If the reaction is performed under warm or hot conditions (which favor an increase in entropy), E1 elimination is likely to predominate, leading to formation of an alkene. At lower temperatures, S N 1 and E1 reactions are competitive reactions and it becomes difficult to favor one over the other. Even if the reaction is performed cold, some ...

  3. SN2 reaction - Wikipedia

    en.wikipedia.org/wiki/SN2_reaction

    Elimination reactions are usually favoured at elevated temperatures [15] because of increased entropy. This effect can be demonstrated in the gas-phase reaction between a phenolate and a simple alkyl bromide taking place inside a mass spectrometer: [16] [17] Competition experiment between SN2 and E2

  4. Nucleophilic substitution - Wikipedia

    en.wikipedia.org/wiki/Nucleophilic_substitution

    The two main mechanisms were the S N 1 reaction and the S N 2 reaction, where S stands for substitution, N stands for nucleophilic, and the number represents the kinetic order of the reaction. [4] In the S N 2 reaction, the addition of the nucleophile and the elimination of leaving group take place simultaneously (i.e. a concerted reaction).

  5. SNi - Wikipedia

    en.wikipedia.org/wiki/SNi

    With standard S N 1 reaction conditions the reaction outcome is retention via a competing S N i mechanism and not racemization and with pyridine added the result is again inversion. [5] [3] S N i reaction mechanism Sn1 occurs in tertiary carbon while Sn2 occurs in primary carbon

  6. Solvolysis - Wikipedia

    en.wikipedia.org/wiki/Solvolysis

    An example of a solvolysis reaction is the reaction of a triglyceride with a simple alcohol such as methanol or ethanol to give the methyl or ethyl esters of the fatty acid, as well as glycerol. This reaction is more commonly known as a transesterification reaction due to the exchange of the alcohol fragments.

  7. Walden inversion - Wikipedia

    en.wikipedia.org/wiki/Walden_inversion

    For example, in an S N 2 reaction, Walden inversion occurs at a tetrahedral carbon atom. It can be visualized by imagining an umbrella turned inside-out in a gale . In the Walden inversion, the backside attack by the nucleophile in an S N 2 reaction gives rise to a product whose configuration is opposite to the reactant.

  8. Substitution reaction - Wikipedia

    en.wikipedia.org/wiki/Substitution_reaction

    The two reactions are named according tho their rate law, with S N 1 having a first-order rate law, and S N 2 having a second-order. [2] S N 1 reaction mechanism occurring through two steps. The S N 1 mechanism has two steps. In the first step, the leaving group departs, forming a carbocation (C +). In the second step, the nucleophilic reagent ...

  9. Concerted reaction - Wikipedia

    en.wikipedia.org/wiki/Concerted_reaction

    S N 2 reaction of a bromide ion with chloroethane showing the concerted nature of the reaction, the transition state and the predictable stereochemistry through Walden inversion. In chemistry , a concerted reaction is a chemical reaction in which all bond breaking and bond making occurs in a single step .

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