Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds

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Bruice 8th Edition

Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds

Problema 61d

Capitolo 10, Problema 61d

Write the appropriate reagent over each arrow.

Guida verificata passo dopo passo

Step 1: Analyze the first transformation (A). The starting material is a cyclohexyl bromide, and the product is cyclohexene. This suggests an elimination reaction. To achieve this, a strong base such as potassium tert-butoxide (K⁺[CH₃]₃CO⁻) or sodium ethoxide (NaOEt) can be used under heat to promote the E2 elimination mechanism.

Step 2: Understand the mechanism of the elimination reaction. The base abstracts a proton from the β-carbon (adjacent to the carbon bonded to bromine), leading to the formation of a double bond and the expulsion of the bromide ion.

Step 3: Analyze the second transformation (B). The product is a cyclohexane derivative with two hydroxyl groups in a cis configuration. This suggests a syn-dihydroxylation reaction of the alkene intermediate.

Step 4: To achieve syn-dihydroxylation, reagents such as osmium tetroxide (OsO₄) followed by a reducing agent like sodium bisulfite (NaHSO₃) or potassium permanganate (KMnO₄) under mild conditions can be used. These reagents add hydroxyl groups to the same face of the double bond.

Step 5: Verify stereochemistry. The cis-diol product indicates that the hydroxyl groups are added to the same side of the cyclohexene ring, consistent with the syn-dihydroxylation mechanism.

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