Question
Give the oxiranes formed by the epoxidation reactions of cis- and trans-2-butenes. Also write the mechanism of this reaction.
Answer :
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In epoxidation of alkenes using a peroxyacid such as mCPBA, cis- and trans-2-butenes yield stereospecific oxiranes due to concerted addition of an oxygen atom across the double bond. Cis-2-butene gives cis-2,3-dimethyloxirane, where both methyl groups remain on the same side of the three-membered epoxide ring because
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