The SN1 Mechanism: This page contains a detailed explanation of SN1 reactions including transition states and stereochemistry.
The SN2 Mechanism: This page contains a detailed explanation of SN2 reactions including transition states and stereochemistry.
When Is the Mechanism SN1 or SN2?: This page contains a handy guide to determining if a reactions mechanism is SN1 or SN2.
Master Organic Chemistry
Walkthrough of Substitution Reactions (1) – Introduction
