Bisallylic is a term used in organic chemistry to describe a molecule that has two allylic functional groups. Allylic functional groups are groups that are attached to a carbon atom that is next to a carbon-carbon double bond. Some synonyms for bisallylic include diallylic, or having two allyl groups; bis(2-propenyl), or having two 2-propenyl groups; and 1,5-diene, or having two double bonds that are separated by a single carbon atom. These terms are often used interchangeably and refer to molecules with similar chemical structures and properties. Bisallylic compounds are important in the synthesis of many natural products and pharmaceuticals.