Taking a Look at Nucleophilic Reactions

2127 WordsJan 28, 20189 Pages
Nucleophilic reactions occur when there is an electron pair donor and an electron pair acceptor (2). There are two types of ways that nucleophilic reactions occur. There is the SN1 reaction and the SN2 reaction. An SN1 is a two-step reaction that occurs when a molecule first forms a carbocation. Once the carbocation is formed, the nucleophile comes in and attaches to the molecule (2). Below is a general reaction scheme of an SN1 reaction: Below is the mechanistic scheme of SN1: In an SN2 reaction, it is a one-step reaction and occurs when a nucleophile attacks a molecule and forces the leaving of a leaving group. Below is the mechanistic scheme of SN2: Reaction kinetics is the study of the rates of chemical reactions. From these chemical mechanisms, one derives the rate laws which will show how fast or slow a reaction is occuring and figure out if a first order or a second order reaction is occuring (1). The first order reaction is an SN1 reaction. A first order reaction has a rate proportional to the concentration of one reaction. A first order reaction formula will be : Rate =k[A] or rate=k[B] A second order reaction is an SN2 reaction. A second order reaction has a rate proportional to the concentration of both reactants. The formula is as follows: Rate=k[A][B] SN1 reactions proceed through a carbocation, the product is a racemic mixture of the substitution product which is a 50/50 racemic mixture. SN2 reactions do not form carbocation, but require the

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