A growing interest in organocatalysts, catalytic reactions employing entirely organic catalysts, has made organocatalysis indispensable. However, there can be a misconception that organocatalysts are based only on nitrogen-containing functional groups and are useful only for asymmetric reactions. This book shows that the umbrella of organocatalysis covers other main group elements besides nitrogen and is not limited to asymmetric methods. Many of the catalysts and mechanisms discussed may not have a viable asymmetric variant or cannot be rendered asymmetric at all.