Question

Complete the given $S_{N}2$ reactions. The stereochemistry of the product is:

• A. $S,S$
• B. $R,S$
• C. $S,R$
• D. $R,R$

Answer 1

Answer: (B), (C)

$R,S$
$S,R$

Epoxide ring is opened to form $2$-butylcyclooctanol. The butyl group and $OH$ group have anti configuration as it is the result of $S_{N}2$ attack involving inversion of configuration. The product is a mixture with $R,R$ and $S,S$ configurations.