烯烃 olefin： 烯烃是指含有C=C键（碳碳双键）的碳氢化合物。属于不饱和烃，分为链烯烃与环烯烃。会发生加成反应。可由卤代烷与氢氧化钠醇溶液反应制得，也可由醇失水或由邻二卤代烷与锌反应制得。小分子烯烃主要来自石油裂解气。环烯烃在植物精油中存在较多，许多可用作香料。 烯类是有机合成中的重要基础原料，用于制聚烯烃和合成橡胶。
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