The claim this map rests on
Organic chemistry looks like thousands of reactions with people's names attached. Diels–Alder. Wittig. Claisen. Beckmann. Learned as a list, it is hopeless. Nobody can hold that list.
Underneath the list there are about a dozen elementary steps. Every named reaction is a sentence written from that small alphabet. Once you know the alphabet, an unfamiliar reaction stops being something to recall and becomes something to work out.
One rule underneath everything
Chemistry happens when electrons move. They move in exactly one direction: out of an orbital that is full and into one that is empty. That is the entire engine.
- Electron-rich — the source
- Electron-poor — the sink
- The electrons themselves
Every remaining chapter answers one of just two questions. What makes this atom rich or poor? — that is structure, orbitals, and pKa. What makes the flow fast or slow? — that is energy, geometry, and selectivity.
Seven master keys
These are the ideas that make later chapters feel like revision rather than new material. Each page in this collection hangs off at least one of them.
Key seven is the one that makes the others usable. It has its own page: the curly-arrow alphabet, the twelve moves everything is built from.
Two patterns generate most of the book
Carbon on its own is neither rich nor poor. Its neighbours decide. Two arrangements come up so often that recognising them carries you through roughly half of the chapters.
- Electron-rich — attacks
- Electron-poor — is attacked
- Bond framework
How the subject is layered
Read in this order. Each tier is nearly useless before the one above it, and nearly obvious after it.
| Tier | The question it answers | Chapters |
|---|---|---|
| Seeing | Molecules are invisible — how do we know what they are, and why are they that shape? | 2–4, 7, 13, 16, 18 |
| Grammar | What is the notation, which number predicts reactivity, and what decides fast versus favourable? | 5, 8, 12 |
| Patterns | How do the two polarity patterns actually play out? | 6, 9–11, 15, 17, 19–22, 25, 26, 36 |
| Control | With many reactive sites, how do you make just one of them react? | 14, 23, 24, 31–33, 41 |
| Other engines | What happens when bonds form without ion pairs at all? | 34, 35, 37, 38, 40 |
| Building | How do you plan a molecule backwards, and how does nature do it? | 28–30, 42, 43 |
The route through
Fourteen pages, each answering exactly one question. Built pages are linked; the rest are planned and follow the tier order above.
How we know structure · Orbitals, shape and delocalisation
The curly-arrow alphabet · pKa, the master ruler · How far and how fast
The carbonyl · Enols and polarity reversal · Alkenes and arenes · sp³ carbon, the four-way race
Stereochemistry foundations · Selectivity, the real game
Beyond the curly arrow — radicals, carbenes, pericyclic, metals
Retrosynthesis · The chemistry of life
How you will know it worked
The test of understanding here is not recall. It is generation: being handed a reaction you have never met and working it out on the spot. Try these four steps on anything unfamiliar.
Look for a lone pair, a negative charge, or a pi bond with nothing pulling on it.
Look for a positive charge, an empty orbital, or a carbon next to oxygen or a halogen.
Tail on the electrons, head where they land. Then ask what has to leave to keep the octet.
Better leaving group, stronger nucleophile, catalyst, or a geometry that lets the orbitals meet.
If those four steps produce a sensible product for a reaction nobody taught you, the compression has done its job. Start with the alphabet.