Q1P - Organic Chemistry (Mcmurry)

Question

One problem with elimination reactions is that mixtures of products are often formed. For example, treatment of 2-bromo-2-methylbutane with KOH in ethanol yields a mixture of two alkene products. What are their likely structures?

Step-by-Step Solution

Answer

The mixture of two alkene products is shown below.

Step 1: Elimination reactions

Elimination reactions are the chemical reactions where hydrogen and halogen are removed from the molecule, and it results in alkene formation. This reaction is named hydrohalogenation. A mixture of products is formed that are major and minor.

Step 2: The likely structures of the two alkenes

When 2-bromo-2-methylbutane is treated with KOH in ethanol, dehydrobromination occurs in either of two directions andresults in a mixture of two alkene products. These two alkene products are 2-methylbut-2-ene and 2-methylbut-1-ene.

The mixture of two alkene products