Ethers can often be prepared by SN^2 reaction of alkoxide ions, RO^- with alkyl halides. Suppose

step 1 In question number 11 .60, it is said that ethers can be prepared by S &2 reactions of alcoxide

Ethers can often be prepared by SN^2 reaction of alkoxide...

Ethers can often be prepared by $\mathrm{S}_{\mathrm{N}}^{2}$ reaction of alkoxide ions, $\mathrm{RO}^{-}$ with alkyl halides. Suppose you wanted to prepare cyclohexyl methyl ether. Which of the two possible routes shown below would you choose? Explain.

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Key Concepts

Selection of Alkyl Halide in Ether Synthesis

In ether synthesis via an SN2 reaction, selecting an alkyl halide with minimal steric bulk is essential to maximize the reaction rate. For synthesizing cyclohexyl methyl ether, using a methyl halide with a cyclohexoxide ion is preferred because the methyl group is less hindered and therefore more accessible to nucleophilic attack compared to using a cyclohexyl group.

Steric Hindrance

Steric hindrance refers to the spatial congestion of groups around the reactive site, which can block the approach of a nucleophile in an SN2 reaction. When synthesizing ethers, this factor is crucial because bulky alkyl halides or substituents slow down or prevent the nucleophilic attack necessary for the reaction to proceed efficiently.

SN2 Mechanism

The SN2 mechanism is characterized by a single-step, bimolecular process in which the nucleophile attacks the electrophilic carbon at the same time as the leaving group departs. This mechanism is highly sensitive to steric hindrance, as the nucleophile requires a clear path for backside attack, favoring less substituted (usually primary or methyl) carbons over more substituted ones.

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