When 2,2-Dimethyloxirane (See Figure Below)undergoes Anionic Polymerization,the Nucleophile Attacks the Least
When 2,2-dimethyloxirane (see figure below)undergoes anionic polymerization,the nucleophile attacks the least substituted carbon of the epoxide,but when it undergoes cationic polymerization,the nucleophile attacks the most substituted carbon of the epoxide.Explain why this is so. 
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