关键词: 自由基氢膦化, 膦基阳离子, 光催化

The hydrophosphination of olefins represents a fundamental strategy for the construction of P-C bonds in organic synthesis. This work reports a distinct protocol for the synthesis of tertiary phosphine compounds via visible light-catalyzed hydrophosphination of alkenes. The reaction features a broad substrate scope and exceptional functional group compatibility, affording a diverse array of tertiary phosphine products with moderate to excellent yields ranging from 48% to 95%. A plausible reaction mechanism has been proposed based on our previous studies and relevant literature reports. Specifically, photoexcited-catalyst-mediated single-electron oxidation of diphenylphosphine generates the corresponding phosphine radical cations (PRCs), which subsequently undergo radical addition across the carbon-carbon double bonds of alkenes. Furthermore, the formation of trivalent phosphorus species was detected by ³¹P NMR spectroscopy.

Key words: alkene hydrophosphination, phosphine radical cation, photocatalysis