Compound A is an optically active alcohol. Treatment with chromic acid converts A intoa ketone, B. In a separate reaction, A is treated with PBr3, converting A into compound C.Compound C is purified, and then it is allowed to react with magnesium in ether to give aGrignard reagent, D. Compound B is added to the resulting solution of the Grignard reagent. After hydrolysis of the initialproduct (E), this solution is found to contain 3,4-dimethylhexan-3-ol. Propose structures for compounds A, B, C, D, and E.

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Chapter1: Chemical Foundations
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Compound A is an optically active alcohol. Treatment with chromic acid converts A into
a ketone, B. In a separate reaction, A is treated with PBr3, converting A into compound C.
Compound C is purified, and then it is allowed to react with magnesium in ether to give a
Grignard reagent, D. Compound B is added to the resulting solution of the Grignard reagent. After hydrolysis of the initial
product (E), this solution is found to contain 3,4-dimethylhexan-3-ol. Propose structures for compounds A, B, C, D, and E.

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