- Electrophilic Additions
An excellent and thorough overview of electrophilic addition to alkenes.
- Carbocation Rearrangements
An equally exhaustive treatise on carbocation rearrangements.
- Radical Additions
This site has a detailed introduction into radical addition to pi bonds.
- Degrees of Unsaturation
This site offers several tutorials including determining degrees of unsaturation from a structure or formula.
- Retrosynthetic Analysis
A very detailed discussion of retrosynthetic analysis.
- Alkyne Reactions
A detailed study of different alkyne reactions, including good mechanistic discussions.
- Periodic Table
This link provides access to a very nice electronic periodic table.
- Virtual Modeling
This site has a virtual modeling set (Chime or Rasmol required).
- Organic Practice
This site has multiple-choice questions on organic chemistry.
This site has Web-based flashcards.
A reaction roadmap shows interconversions of functional groups, etc.
- Organic Reaction Mechanisms
Detailed information on virtually all types of organic reactions.
- MSDS Sheets
Here is an excellent searchable database of MSDS sheetsgood companion to an organic lab course.