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Chapter 12: Problem 13

What product would you expect from \(\mathrm{S}_{\mathrm{N}}\) 2 reaction of 1 -bromobutane with each of the following? (a) NaI (b) KOH (c) \(\mathrm{H}-\mathrm{C} \equiv \mathrm{C}-\mathrm{Li}\) (d) \(\mathrm{NH}_{3}\)

Short Answer

Expert verified
The products are 1-iodobutane, 1-butanol, 1-butynylbutane, and butylamine respectively.

Step by step solution

01

Identify the reaction type

The problem asks for the product of an \( \text{S}_\text{N}2 \) reaction involving 1-bromobutane. An \( \text{S}_\text{N}2 \) reaction is a bimolecular nucleophilic substitution, where a nucleophile attacks an electrophilic carbon, displacing a leaving group (here, bromide).
02

Analyze the reaction with NaI

In the presence of \( \text{NaI} \), iodide ion \( \text{I}^- \) acts as the nucleophile. It attacks the electrophilic carbon bound to bromine, replacing bromine and forming 1-iodobutane, \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{I} \).
03

Analyze the reaction with KOH

For \( \text{KOH} \), hydroxide ion \( \text{OH}^- \) is the nucleophile. It attacks the electrophilic carbon, displacing bromine to form butanol, specifically 1-butanol, \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{OH} \).
04

Analyze the reaction with H-C鈮-Li

In this case, the acetylide ion \( \text{HC} \equiv \text{C}^- \) serves as the nucleophile. It attacks the carbon attached to bromine, resulting in the formation of 1-butynylbutane, \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{C}\equiv\text{CH} \).
05

Analyze the reaction with NH3

Ammonia \( \text{NH}_3 \) in its deprotonated form, \( \text{NH}_2^- \) (though ammonia itself is a neutral nucleophile), can act as a nucleophile attacking the electrophilic carbon, leading to the displacement of bromine and formation of butylamine \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{NH}_2 \).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Nucleophilic Substitution
Nucleophilic substitution is a core reaction type in organic chemistry where a nucleophile targets an electrophilic carbon, displacing an existing group known as the leaving group.
  • The nucleophile is electron-rich and seeks to donate electrons.
  • The electrophilic carbon is part of the molecule that attracts the nucleophile due to electron deficiency.
  • The leaving group is typically a halide, such as bromide in the case of 1-bromobutane, and leaves the reacting molecule upon substitution.
In the \( \text{S}_\text{N}2 \) reaction, the substitution occurs in one step wherein the nucleophile attacks and the leaving group departs simultaneously. This creates an inversion of configuration, which is an important aspect when considering stereochemistry.
Organic Chemistry
Organic chemistry involves the study of carbon-containing compounds, which are central to life and industrial processes. Reactions, like \( \text{S}_\text{N}2 \), are foundational in understanding how these compounds transform.
  • This field examines how atoms are arranged and how molecules interact.
  • Reactions are driven by the properties of molecules such as polarity and electron configuration.
  • Many synthetic processes in pharmaceuticals and materials science rely on organic reactions.
Understanding fundamental reactions like nucleophilic substitutions allows chemists to predict reaction pathways and product formations in more complex systems.
Reaction Mechanisms
A reaction mechanism describes the step-by-step process by which reactants transform into products. For \( \text{S}_\text{N}2 \) reactions, the mechanism displays specific characteristics:
  • Bimolecular: The reaction involves interactions between two molecules, the nucleophile and the substrate.
  • Concerted Process: Substitution occurs in a single step without intermediates.
  • Backside Attack: The nucleophile approaches the carbon opposite the leaving group, leading to an inversion of molecular geometry.
Understanding the mechanism helps in predicting reaction outcomes and knowing how changes in conditions might affect the reaction speed or yield.
Halides
Halides are a class of compounds where a halogen atom is bonded to a carbon skeleton. In nucleophilic substitutions, they often act as leaving groups:
  • Common halides include chloride, bromide, and iodide.
  • Bromine in 1-bromobutane is a typical leaving group in \( \text{S}_\text{N}2 \) reactions due to its decent balance of leaving group ability and reactivity.
  • The strength of the halide leaving group can affect both the rate and the outcome of the reaction.
By knowing the nature of the halide, chemists can predict how easily a nucleophilic substitution might occur and what products could be synthesized.
1-Bromobutane Reactions
1-Bromobutane is a simple alkyl halide used to illustrate nucleophilic substitutions. Different nucleophiles produce varied products as they react with this compound:
  • With NaI, iodide replaces bromide, forming 1-iodobutane.
  • With KOH, hydroxide results in the formation of 1-butanol.
  • The acetylide ion from \( \text{H-C} \equiv \text{C-Li} \) forms 1-butynylbutane.
  • Ammonia forms butylamine when displacing bromine.
These reactions highlight the versatility of 1-bromobutane and its use in demonstrating fundamental principles of organic chemistry.

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Most popular questions from this chapter

Which would you expect to undergo E2 elimination faster, trans-1-bromo4-tert- butylcyclohexane or cis-1-bromo-4-tert-butylcyclohexane? Draw each molecule in its more stable chair conformation, and explain your answer.

Draw structures corresponding to the following IUPAC names: (a) 2 -Chloro-3,3-dimethylhexane (b) 3,3 -Dichloro-2-methylhexane (c) 3-Bromo-3-ethylpentane (d) 1,1 -Dibromo-4-isopropylcyclohexane (e) 4 -sec-Butyl-2-chlorononane (f) 1,1 -Dibromo-4-tert-butylcyclohexane

How would you prepare the following compounds, starting with cyclopentene and any other reagents needed? (a) Chlorocyclopentane (b) Methylcyclopentane (c) 3-Bromocyclopentene (d) Cyclopentanol (e) Cyclopentylcyclopentane (f) Cyclopenta-1,3-diene

What product(s) would you expect from the reaction of 1 -methylcyclohexene with NBS?

Propose structures for compounds that fit the following descriptions: (a) An alkyl halide that gives a mixture of three alkenes on E2 reaction (b) An organic halide that will not undergo nucleophilic substitution (c) An alkyl halide that gives the non-Zaitsev product on E2 reaction (d) An alcohol that reacts rapidly with \(\mathrm{HCl}\) at \(0^{\circ} \mathrm{C}\)
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