We saw in Section 17.4 that ketones react with NaBH₄ to yield alcohols. We?ll also see in Section 22.3 that ketones react with Br₂ to yield a-bromo ketones. Perhaps surprisingly, treatment with NaBH₄ of the a-bromo ketone from acetophenone yields an epoxide rather than a bromo alcohol. Show the structure of the epoxide, and explain its formation.

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CH2BR NABH Ерохide CH3 Br2 An a-bromo ketone Acetophenone