The configurations of the reactant and the pr | vedclass

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(A) The reaction is an $S_N2$ reaction,which proceeds with inversion of configuration at the chiral center.For the reactant: The priorities of the gro

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$S, S$

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(A) The reaction is an $S_N2$ reaction,which proceeds with inversion of configuration at the chiral center.For the reactant: The priorities of the groups attached to the chiral carbon are: $1: -Br$,$2: -CO_2CH_3$,$3: -D$,$4: -H$. Since the lowest priority group $(-H)$ is on a vertical bond,the clockwise sequence $1$ $\rightarrow 2$ $\rightarrow 3$ corresponds to the $S$ configuration.For the product: The $-CN$ group replaces $-Br$. The priorities are: $1: -CN$,$2: -CO_2CH_3$,$3: -D$,$4: -H$. The lowest priority group $(-H)$ is on a vertical bond. The clockwise sequence $1$ $\rightarrow 2$ $\rightarrow 3$ corresponds to the $S$ configuration.Thus,both the reactant and the product have the $S$ configuration.

The configurations of the reactant and the product in the following reaction,respectively,are:

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