Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene

Bruice8th EditionOrganic ChemistryISBN: 9780135213711Not the one you use?Change textbook

Bruice 8th Edition

Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene

Problem 65

Chapter 9, Problem 65

Draw all the products of the following reaction:

Verified step by step guidance

Step 1: Analyze the reactants. The molecule shown is a cyclooctatrienyl cation (C8H7+), which is aromatic due to its Huckel rule compliance (4n+2 π electrons, where n=1). It is bonded to a chlorine atom. The other reactant is hydroxide ion (HO⁻), a strong nucleophile and base.

Step 2: Consider the reaction mechanism. The hydroxide ion can act as a nucleophile and attack the positively charged carbon atom bonded to chlorine, leading to a substitution reaction. This is likely an SN2 mechanism due to the steric accessibility of the carbon.

Step 3: Predict the product of the substitution. The chlorine atom will be replaced by the hydroxide group, resulting in the formation of a cyclooctatrienyl alcohol (C8H7OH).

Step 4: Consider any possible side reactions. Since hydroxide is a strong base, it could also abstract a proton from the cyclooctatrienyl cation, leading to the formation of a neutral cyclooctatriene molecule (C8H8).

Step 5: Draw all possible products. The main product is cyclooctatrienyl alcohol (C8H7OH), and a potential side product is cyclooctatriene (C8H8). Ensure to represent the aromaticity in the structures of the products.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Reaction Mechanisms

Understanding reaction mechanisms is crucial in organic chemistry as they describe the step-by-step process by which reactants transform into products. This includes identifying intermediates, transition states, and the movement of electrons. A clear grasp of mechanisms helps predict the products formed in a reaction.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Recognizing functional groups in the reactants allows chemists to anticipate how they will interact and what products will be formed. This knowledge is essential for drawing accurate reaction products.

Stereochemistry

Stereochemistry involves the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In reactions, the stereochemistry of reactants can lead to different stereoisomers as products. Understanding stereochemistry is vital for accurately representing all possible products, especially in reactions involving chiral centers.

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Related Practice

Textbook Question

Are the following pairs of structures resonance contributors or different compounds?

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Textbook Question

a. Draw resonance contributors for the following species, showing all the lone pairs:

b. For each species, indicate the most stable resonance contributor.

3. NO₂^-

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Textbook Question

Draw resonance contributors for the following ions:

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Textbook Question

a. Draw resonance contributors for the following species. Do not include structures that are so unstable that their contributions to the resonance hybrid would be negligible. Indicate which are major contributors and which are minor contributors to the resonance hybrid.

b. Do any of the species have resonance contributors that all contribute equally to the resonance hybrid?

15.

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Textbook Question

a. How many linear dienes have molecular formula C₆H₁₀? (Disregard cis–trans isomers.)

b. How many of the linear dienes in part a are conjugated dienes?

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Textbook Question

Draw resonance contributors for the following ions:

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