The allyl group is a functional group with the structural formula CH2=CH-CH2-. It is a common building block in organic chemistry and polymer chemistry. The presence of the double bond makes the allyl group reactive and allows it to participate in various polymerization reactions.

烯丙基是一种官能团，结构式为 CH2=CH-CH2-。它是 有机化学和高分子化学中常见的结构单元。双键的存在使烯丙基具有反应活性，并使其能够参与各种聚合反应。