Abstract
1,2-Bis(diphenylphosphino)ethenes and -ethanes (DPPEs) are among representative supporting ligands in transition metal catalysts, which can promote otherwise challenging organic transformations with high efficiency and selectivity. Such bidentately coordinating ligands are conventionally prepared by nucleophilic substitution reactions of halogenated carbon electrophiles with nucleophilic metal phosphides. However, they suffer from poor functional group compatibility and/or tedious preparation of highly functionalized starting substrates. In this context, additions of phosphines to readily available and simple alkynes and alkenes have recently received significant attention. This digest paper focuses on recent developments of diphosphination of alkynes and alkenes for the synthesis of DPPE-type ligands. The reported approaches are categorized into several types of reactions, and their scope, limitation, and mechanism are briefly summarized.
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