Organic chemistry with biological applications

John E. McMurry

ISBN #9781285842912

3rd Edition

1,528 Questions

13,325 Students Helped

Homework Questions

Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

Organic chemistry reaction mechanisms, ranging from radical to polar processes, are unified by a few fundamental principles including bond breaking, bond formation, and electron movement. By understanding reaction types, using curved-arrow notation, interpreting energy diagrams, and appreciating the role of catalysts, students gain a coherent framework to predict and explain chemical behavior both in the lab and in biological systems. The study also emphasizes the importance of reaction thermodynamics in assessing reaction feasibility.

Learning Objectives

Key Concepts

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. •

Example Problems

Example 1

Classify each of the following reactions as an addition, elimination, substitution, or rearrangement: (a) $\mathrm{CH}_{3} \mathrm{Br}+\mathrm{KOH} \rightarrow \mathrm{CH}_{3} \mathrm{OH}+\mathrm{KBr}$ (b) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Br} \rightarrow \mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}+\mathrm{HBr}$ (c) $\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}+\mathrm{H}_{2} \rightarrow \mathrm{CH}_{3} \mathrm{CH}_{3}$

Example 2

Radical chlorination of alkanes is not generally useful because mixtures of products often result when more than one kind of $\mathrm{C}-\mathrm{H}$ bond is present in the substrate. Draw and name all monochloro substitution products $\mathrm{C}_{6} \mathrm{H}_{13} \mathrm{Cl}$ you might obtain by reaction of 2 -methylpentane with $\mathrm{Cl}_{2}$.

Example 3

Using a curved arrow, propose a mechanism for formation of the cyclopentane ring of prostaglandin $\mathrm{H}_{2}$.

Example 4

Which of the following species are likely to be nucleophiles and which electrophiles? (a) $\mathrm{CH}_{3} \mathrm{Cl}$ (b) $\mathrm{CH}_{3} \mathrm{~S}^{-}$ c. d.

Example 5

An electrostatic potential map of boron trifluoride is shown. Is $\mathrm{BF}_{3}$ likely to be a nucleophile or an electrophile? Draw a Lewis structure for $\mathrm{BF}_{3}$, and explain your answer.