Tri(1-adamantyl)phosphine: Expanding the Boundary of Electron-Releasing Character Available to Organophosphorus Compounds
作者:Liye Chen、Peng Ren、Brad P. Carrow
DOI:10.1021/jacs.6b03215
日期:2016.5.25
We report here the remarkable properties of PAd3, a crystalline air-stable solid accessible through a scalable SN1 reaction. Spectroscopic data reveal that PAd3, benefiting from the polarizability inherent to large hydrocarbyl groups, exhibits unexpected electron releasing character that exceeds other alkylphosphines and falls within a range dominated by N-heterocyclic carbenes. Dramatic effects in
[EN] TRI-(ADAMANTYL)PHOSPHINES AND APPLICATIONS THEREOF<br/>[FR] TRI-(ADAMANTYL)PHOSPHINES ET LEURS APPLICATIONS
申请人:UNIV PRINCETON
公开号:WO2017075581A1
公开(公告)日:2017-05-04
In one aspect, phosphine compounds comprising three adamantyl moieties (PAd3) and associated synthetic routes are described herein. Each adamantyl moiety may be the same or different. For example, each adamantyl moiety (Ad) attached to the phosphorus atom can be independently selected from the group consisting of adamantane, diamantane, triamantane and derivatives thereof. Transition metal complexes comprising PAd3 ligands are also provided for catalytic synthesis including catalytic cross-coupling reactions.
A new family of phosphine ligands bearing a bulky carbazolyl scaffold is described. With the combination of ligand 2a and Pd(OAc)2, difficult tri-ortho-substituted biaryl couplings are accomplished smoothly. In particular, the catalyst loading as low as 0.02 mol% of Pd for non-activated 2,6-disubstituted aryl chloride coupling can be achieved.
Pd at the crossroads: The palladium‐catalyzedcross‐coupling of nitroarenes has eluded chemists for decades. Recently, the first palladium‐catalyzed Suzuki–Miyaura and Buchwald–Hartwig cross‐couplings of nitroarenes were reported. Mechanistically, this process involves the challenging oxidative addition of LPd0 into the Ar−NO2 bond. This process features a broad substrate scope with respect to both
Halogen‐Bridged Methylnaphthyl Palladium Dimers as Versatile Catalyst Precursors in Coupling Reactions
作者:Nardana Sivendran、Nico Pirkl、Zhiyong Hu、Angelino Doppiu、Lukas J. Gooßen
DOI:10.1002/anie.202110450
日期:2021.11.15
Halide-bridged 1- and 2-methylnaphthyl palladium dimers are presented as convenient, yet highly efficient palladium sources for cross-coupling catalysis. The bench-stable complexes smoothly react with various ligands yielding monoligated palladium precatalysts. These display record-setting activity in various catalytic reactions, clearly beyond that achievable by ligand screening alone.