一种元素有机化合物,为一种极有用的有机合成试剂.学名亚烷基三苯基磷烷.1954年由E.G.Wittig制得.维蒂希试剂可用两种共振式表示：(C6H5)3PCR′R″(C6H5)3R′R″前者称叶林,后者称叶立德(R′、R″为不同的烷基).叶林结构表示分子的极性小,在磷外围有10个电子,意味着磷的d轨道也参与了成键；叶立德结构表示分子是极性的,偶极矩较大,这是维蒂希试剂起反应的主要原因.
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