Question

based on conditions, identify where a nucleophilic attack would occur on the following epoxides. image of two epoxide structures labeled acidic (with i, ii) and basic (with iii, iv) a. i and iii b. i and iv c. ii and iii d. ii and iv

Explanation:

Step1: Analyze Acidic Conditions

In acidic conditions, the epoxide oxygen is protonated, making the ring more electrophilic. The nucleophilic attack occurs at the more substituted carbon (due to better stabilization of positive charge in the transition state). Here, position II (more substituted) is attacked in acidic conditions.

Step2: Analyze Basic Conditions

In basic conditions, the nucleophile attacks the less substituted carbon (due to steric hindrance; the less substituted carbon is more accessible). Here, position III (less substituted) is attacked in basic conditions.

Step3: Match with Options

From acidic (II) and basic (III) attacks, the correct pair is II and III, which corresponds to option C.

Answer:

C. II and III