How to Use This Book
The book has 40 chapters across 8 parts, plus 14 appendices and an instructor guide. This chapter is a short manual for the reader.
Three learning paths
Not every reader needs every chapter on the first pass.
📘 Semester 1 (Organic Chemistry I)
Parts I through IV. Foundations → Stereochemistry → Substitution & Elimination → Addition Reactions. By the end you should be able to draw any simple organic structure, predict acid-base behavior from $pK_a$, assign stereochemistry, and predict the outcome of any $S_{N}2$, $S_{N}1$, $E2$, $E1$, or addition reaction.
📗 Semester 2 (Organic Chemistry II)
Parts V through VIII. Aromatic Chemistry → Carbonyl Chemistry → Bioorganic → Advanced Topics & Synthesis. By the end you should be able to perform retrosynthetic analysis on a complex target and defend every step with a mechanism.
🔬 Honors / Advanced
Both semesters plus the computational sidebars. The capstone chapter (38) is built around a complete total synthesis and is worth reading even if a standard course does not reach it.
The structure of a chapter
Each chapter has seven files. In typical reading order:
| File | What it is | When to read it |
|---|---|---|
index.md |
The main chapter — 8,000–12,000 words. The mechanism, the worked examples, the biological connection. | First. |
exercises.md |
~40 problems, from routine to challenging. Mechanism-drawing, product-prediction, synthesis, spectroscopic identification, error-finding. | Work them as you finish each section of the main chapter. |
quiz.md |
~20 short questions for self-assessment. | After finishing the chapter but before moving on. |
case-study-01.md |
A real-world pharmaceutical or biological application. | When you want to see the chapter's ideas in a specific context. |
case-study-02.md |
A real-world industrial, materials, or environmental application. | When you want a second, differently-flavored context. |
key-takeaways.md |
Five to ten bullets you must leave with. | As a final check, and later as a pre-exam review. |
further-reading.md |
Pointers to the primary literature, to McMurry / Klein / Clayden, and to specific online resources. | When you want to go deeper. |
The mathematics
We use standard organic-chemistry math. No calculus. The only symbols you will see repeatedly:
- $pK_a$ — the logarithmic acid dissociation constant. If you remember nothing else from this book, remember how to use $pK_a$ to predict nucleophilicity, leaving-group ability, and equilibrium position.
- $\Delta G = \Delta H - T\Delta S$ — free energy change of a reaction.
- $\Delta G^{\ddag}$ — free energy of activation (the barrier height for a reaction).
- Rate laws like $\text{rate} = k[\text{A}][\text{B}]$ — applied, not derived.
The notation
- Structures and simple formulas appear inline — acetic acid is $\text{CH}_3\text{COOH}$.
- Full molecular structures appear as SVG images in most chapters. Every image has a plain-language caption. If the image does not render in your viewer, the surrounding text is always enough to follow the mechanism.
- SMILES strings appear occasionally in code blocks for readers who want to reproduce a structure in their molecular-modeling software — aspirin is
CC(=O)OC1=CC=CC=C1C(=O)O. - Mechanism arrows are drawn in red. See the arrow conventions guide for the full visual vocabulary.
Six recurring callouts
Learn to recognize them:
Mechanism Map: A conceptual diagram showing how one mechanism principle applies across multiple functional groups.
Worked Problem: A problem solved step by step, with the reasoning made explicit. Work these with a pencil in hand.
Biological Connection: The same mechanism as it appears in a biological system — metabolism, biosynthesis, drug action.
Computational Exercise: A short activity in Avogadro, WebMO, or GAMESS. Free software; we tell you which one and how to set it up.
Spectroscopy Clue: How to recognize this functional group or reaction in an IR, NMR, or mass spectrum.
Common Mistake: An error students typically make, what goes wrong, and how to avoid it.
The progressive project
Starting in Chapter 14 (the first synthesis workshop), a running project threads through the rest of the book: synthesize a real pharmaceutical from simple building blocks. Aspirin first, then ibuprofen, then a more complex target. Each chapter that introduces a new reaction adds that reaction to your Synthesis Toolkit (a running callout that summarizes what you have available to use).
By Chapter 38, the capstone, you will be able to look at a drug molecule, disconnect it through retrosynthetic analysis into starting materials, and defend every step with a mechanism. This is what professional organic chemists actually do.
If you get stuck
Every chapter ends with key-takeaways.md and further-reading.md. If the main chapter is confusing, the key takeaways give you the point in five bullets, and the further-reading list tells you which McMurry or Klein chapter covers the same material. Sometimes a different author's voice unlocks an idea.
The appendices are reference tools. Appendix B ($pK_a$ table), Appendix D (spectroscopy shift tables), Appendix F (named reactions), and Appendix G (retrosynthesis disconnections) are the ones you will open most often. Bookmark them.
Errors and feedback
This book is open source. File an issue or send a pull request on the project repository. We read them and fix them.