考研有机化学 Cheat Sheet

Key Definitions

• 有机化学 (Organic Chemistry): Study of carbon-containing compounds and their properties.

• 官能团 (Functional Group): Specific group of atoms within a molecule that determines its chemical reactivity.

Important Concepts

分子结构 (Molecular Structure)

• Hybridization: Mixing of atomic orbitals to form new hybrid orbitals.

• 立体化学 (Stereochemistry): Study of the spatial arrangement of atoms in molecules.

反应机制 (Reaction Mechanisms)

• 亲核反应 (Nucleophilic Substitution): Reaction where a nucleophile replaces a leaving group.

• 消除反应 (Elimination Reaction): Reaction that removes atoms or groups from a molecule, forming a double bond.

Key Formulas

• R: Alkyl group

• X: Leaving group (e.g., Br, Cl)

• Nu: Nucleophile

E1: R-X → R^+ + X^- → R=R + H^+

• R^+: Carbocation intermediate

Common Mistakes to Avoid

Common Mistake: Confusing E1 and E2 mechanisms; remember E1 involves a carbocation, while E2 is concerted.

Memory Tricks

Tip: "SN1, SN2, E1, E2" —

• S: Substitution

• N: Nucleophilic

• E: Elimination

• 1: Unimolecular

• 2: Bimolecular

Key Diagrams

   R
   |
R-C-X
   |
   Nu

     R
     |
R-C^+ → R=R + H^+