2-(Dicyclohexylphosphino)-2,4,6-triisopropylbiphenyl丨CAS 564483-18-7

2-(Dicyclohexylphosphino)-2,4,6-triisopropylbiphenyl is a highly sterically hindered, electron-rich phosphine ligand widely used in homogeneous catalysis and organometallic chemistry. It is particularly employed in palladium-catalyzed cross-coupling reactions, such as Buchwald–Hartwig amination, Suzuki–Miyaura coupling, and Negishi reactions, where it facilitates the efficient formation of carbon–carbon and carbon–heteroatom bonds. Its bulky biphenyl backbone and dicyclohexylphosphino group improve catalyst stability and activity, enabling high yields and selectivity even with challenging substrates, such as aryl chlorides and sterically hindered electrophiles. This ligand is also used in pharmaceutical and fine chemical synthesis to construct complex molecules, intermediates, and active pharmaceutical ingredients under mild and highly controlled conditions.

The benefits of this ligand arise from its combination of steric bulk and electron-rich character. The dicyclohexylphosphino group donates electron density to the metal center, enhancing reactivity, while the triisopropyl-substituted biphenyl scaffold provides steric protection, preventing catalyst deactivation and side reactions. This leads to increased catalytic efficiency, higher turnover numbers, and improved selectivity in demanding cross-coupling reactions. Its stability and solubility in organic solvents make it suitable for both laboratory-scale and industrial processes. Additionally, its design allows for the activation of less reactive aryl halides, expanding the scope of substrates and facilitating the synthesis of structurally complex compounds with precision.