Predict the major organic product obtained in each of the...

Predict the major organic product obtained in each of the following reactions. Assume that [O] represents $\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ in $\mathrm{H}_{2} \mathrm{SO}_{4}$ (a) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCH}_{2} \mathrm{OH}+\mathrm{HBr} \longrightarrow$ (b) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{K} \longrightarrow$ (c) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHOH} \stackrel{[\mathrm{O}]}{\longrightarrow}$ (d) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{I} \longrightarrow$

Predict the major organic product obtained in each of the following reactions. Assume that [O] represents $\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ in $\mathrm{H}_{2} \mathrm{SO}_{4}$
(a) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCH}_{2} \mathrm{OH}+\mathrm{HBr} \longrightarrow$
(b) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{K} \longrightarrow$
(c) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHOH} \stackrel{[\mathrm{O}]}{\longrightarrow}$
(d) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{I} \longrightarrow$

Key Concepts

Alcohol Reaction with Hydrogen Halides

This concept involves the reaction of alcohols with hydrogen halides, where the hydroxyl group is first protonated to form a good leaving group. The reaction can proceed via an SN1 or SN2 mechanism depending on the structure of the alcohol, and in some cases, carbocation rearrangements occur if they result in a more stable intermediate. This mechanism explains how primary alcohols may be converted into tertiary alkyl halides when rearrangement is possible under acidic conditions.

Reaction of Alcohols with Alkali Metals

When alcohols react with alkali metals, the acidic proton from the hydroxyl group is removed, forming an alkoxide ion and releasing hydrogen gas. This is a redox process where the metal is oxidized and the hydrogen is reduced. The alkoxide formed can often be used as a nucleophile in further synthetic transformations.

Oxidation of Secondary Alcohols

Oxidation of secondary alcohols typically converts the alcohol into a ketone. In this reaction, the hydroxyl-bearing carbon loses hydrogen atoms and forms a carbonyl group. Strong oxidizing agents, often under acidic conditions, facilitate this transformation, which is a key method in organic synthesis for preparing ketones.

Williamson Ether Synthesis

The Williamson ether synthesis is a fundamental reaction used for forming ethers, where an alkoxide ion reacts with an alkyl halide in a nucleophilic substitution reaction. This method allows for the construction of ethers by combining different alkyl groups and is highly valuable for building complex molecules in organic synthesis.

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