Definitions for sn2 reaction
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a bimolecular nucleophilic substitution reaction
The SN2 reaction is a type of nucleophilic substitution, where a lone pair from a nucleophile attacks an electron deficient electrophilic center and bonds to it, expelling another group called a leaving group. Thus the incoming group replaces the leaving group in one step. Since two reacting species are involved in the slow, rate-determining step of the reaction, this leads to the name bimolecular nucleophilic substitution, or SN2. Among inorganic chemists, the SN2 reaction is often known as the interchange mechanism.
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"sn2 reaction." Definitions.net. STANDS4 LLC, 2013. Web. 6 Dec. 2013. <http://www.definitions.net/definition/sn2 reaction>.