Addition of HCl to 1 -methoxycyclohexene yields 1 -chloro- 1...

Addition of $\mathrm{HCl}$ to 1 -methoxycyclohexene yields 1 -chloro- 1 -methoxycyclohexane as a sole product. Use resonance structures of the carbocation intermediate to explain why none of the alternate regioisomer is formed.

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Key Concepts

Electrophilic Addition Mechanism

This concept refers to how acids add to carbon–carbon double bonds through a two-step process. First, the alkene pi bond attacks a proton from the acid, generating a carbocation intermediate. Then, a nucleophile attacks the carbocation to form the final product. The mechanism explains how the electron-rich double bond is converted into a saturated product in the presence of an acid.

Carbocation Stability and Resonance

Carbocations are reactive intermediates whose stabilities greatly influence the reaction outcome. When adjacent to an electron-donating group, such as an alkoxy substituent, the positive charge can be delocalized through resonance. This delocalization stabilizes the carbocation, lowering its energy and directing the reaction pathway toward the formation of a specific intermediate that leads to the observed product.

Regioselectivity in Electrophilic Addition

Regioselectivity in these reactions arises because the formation of the most stable carbocation intermediate is favored. When resonance effects stabilize one possible carbocation more than another, the reaction selectively proceeds through that pathway, leading to a single regioisomer. This explains why only one product is observed, as alternative pathways involving less-stabilized carbocations are not competitive.

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