2-二环己基磷-2′,6′-二异丙氧基-1,1′-联苯

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Buchwald Phosphine Ligands forchemical Synthesis

Common applications

RuPhos developed by the Buchwald group, RuPhos and its palladium precatalyst forms are notable for being air-stable, moisture-stable,and highly soluble, enabling efficient catalysis with lower catalyst loadings and shorter reaction times in organic synthesis.

Notable characteristics & key uses:

• Steric & Electronic Properties: RuPhos′s biaryl structure with 2-dicyclohexylphosphino-2′,6′-diisopropoxybiphenyl configuration provides stability and selectivity. Its electron-rich phosphine and isopropoxy groups enhance catalytic reactivity and substrate compatibility
• Metal Binding: Excels in palladium and nickel-catalyzed processes including Suzuki-Miyaura coupling and Buchwald-Hartwig amination. Has a smaller Tolman cone angle than BrettPhos,donating less electron density to metals.
• Catalyst Stability: RuPhos enhances catalyst longevity and prevents degradation, delivering higher yields even under demanding conditions with superior stability and solubility.
• Versatility: Performs excellently across diverse solvents, temperatures, and reaction environments. Ideal forvaried applications, including Negishi cross-couplings of hindered aryl halides.
• Cross-Coupling Reactions: RuPhos enablesefficient C-C, C-N, C-O, C-F, C-CF₃, and C-S bond formation with minimal by-products. Particularly effective with hindered substrates like cyclic secondary amines.
• Precatalyst Integration: Incorporated into stable precatalysts like RuPhos Pd G3, offering enhanced handling and improved storage stability.
• Enhanced Reaction Conditions: Facilitates milder, environmentally friendly reactions while maintaining high catalytic activity and selectivity.
• Scalability: Suited for both laboratory research and industrial manufacturing, ensuring reproducible results across different operational scales.

Recent Studies and Innovations:

Steric Hindrance Effects: The study indicates that amines with large steric hindrance or halides with electron-withdrawing groups significantly reduce activation energy barriers in RuPhos-catalyzed reactions, enhancing overall catalytic efficiency and substrate scope. (Jiaqi Tian et al., 2020)

Catalyst-Transfer Polymerization (CTP): RuPhos excels in Suzuki−Miyaura catalyst-transfer polymerization (CTP), enabling precise synthesis of conjugated polymers with controlled molecular weights and narrow polydispersity. The ligand effectively facilitates polymerization of both electron-rich (donor) and electron-deficient (acceptor) monomers. (JaehoLee et al., 2021)

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