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Orgo 2: opening epoxides


nancy9494

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Hello

The problem: Suggest reagents for the following transformations. Remember that protic solvents are present to protonate the alkoxide ions that are formed in teh nucleophilic attack on the oxirane. 

I don't understand how the mechanism works. The final product is attacked at the least hindered carbon indicating it is in basic conditions, but the reagent given is an electrophile. I don't understand how it would attack the starting material. 

 

Thank you in advance.

Screen Shot 2018-01-20 at 10.04.09 AM.png

Edited by nancy9494
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