TBR Orgo Chapter 4 Q25 (Sn2/E2

[Synapsis]

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There's this reaction:

TBR says that this elimination reaction has a competing Sn2 Reaction. I thought that we learned that you can essentially eliminate the competing Sn2 reaction with a bulky base, like t-ButOK. Even in the chapter, TBR says a bulky base is used to avoid the substitution product. How can this have a competing Sn2 reaction?

 

[Synapsis]

Bump. Anyone?

 

[QrtrLifeCrisis]

My understanding is that reactions like these are not always 100% pure. You might get a small percentage of substitution product. However, the elimination product should be predominant with these conditions.