John E. McMurry
ISBN #9781285842912
3rd Edition
1,528 Questions
Homework Questions
This section covers the fundamental reactions of alkenes and alkynes including eliminations to form unsaturated compounds and a diverse array of addition reactions that convert them into saturated products. Key methods such as hydroboration–oxidation, oxymercuration–demercuration, and catalytic hydrogenation illustrate how reaction conditions and catalysts dictate regiochemistry and stereochemistry. Conjugated dienes display unique reactivity in electrophilic additions and undergo pericyclic processes like the Diels–Alder reaction, while alkynes react similarly to alkenes but also form acetylide anions useful in carbon–carbon bond synthesis. Overall, mastery of these reaction mechanisms is essential for predicting products and designing efficient organic syntheses in both laboratory and industrial settings.
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CONCEPT
DEFINITION
Definition: The study of molecular reactivity via polar covalent bonds where differences in electronegativity create dipole moments, guiding acid–base behavior.
The study of molecular reactivity via polar covalent bonds where differences in electronegativity create dipole moments, guiding acid–base behavior. •
One problem with elimination reactions is that mixtures of products are often formed. For example, treatment of 2 -bromo-2-methylbutane with KOH in ethanol yields a mixture of two alkene products. What are their likely structures?
How many alkene products, including $E, Z$ isomers, might be obtained by dehydration of 3 -methylhexan-3-ol with aqueous sulfuric acid?
What product would you expect to obtain from addition of $\mathrm{Cl}_{2}$ to 1,2 -dimethylcyclohexene? Show the stereochemistry of the product.
Addition of HCl to 1,2 -dimethylcyclohexene yields a mixture of two products. Show the stereochemistry of each, and explain why a mixture is formed.
What product would you expect from the reaction of cyclopentene with $\mathrm{Br}_{2}$ and water? Show the stereochemistry.