In the synthesis of pure alkyl chlorides via Darzen's procedure, treating an alcohol with yields ret β Haloalkanes and Haloarenes Chemistry Question
Question
In the synthesis of pure alkyl chlorides via Darzen's procedure, treating an alcohol with $SOCl_2$ yields retention of configuration. What happens to the stereochemistry if the reaction is conducted in the presence of pyridine?
Answer: B
π‘ Solution & Explanation
Pyridine neutralizes the $HCl$ byproduct, liberating free $Cl^-$ nucleophiles. This forces the mechanism from internal return ($S_Ni$) to a classical bimolecular $S_N2$ backside attack, yielding strict inversion.
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