HandaPhos: A General Ligand Enabling Sustainable ppm Levels of Palladium-Catalyzed Cross-Couplings in Water at Room Temperature
作者:Sachin Handa、Martin P. Andersson、Fabrice Gallou、John Reilly、Bruce H. Lipshutz
DOI:10.1002/anie.201510570
日期:2016.4.11
complexed in a 1:1 ratio with Pd(OAc)2, enables Pd‐catalyzed cross‐couplings to be run using ≤1000 ppm of this pre‐catalyst. Applications to Suzuki–Miyaura reactions involving highly funtionalized reaction partners are demonstrated, all run using environmentally benign nanoreactors in water at ambient temperatures. Comparisons with existing state‐of‐the‐art ligands and catalysts are discussed herein.
(Aza)Pentacenes Clipped into a Ring: Stabilization of Large (Aza)Acenes
作者:Lukas Ahrens、Olena Tverskoy、Svenja Weigold、Michael Ganschow、Frank Rominger、Jan Freudenberg、Uwe H. F. Bunz
DOI:10.1002/anie.202015348
日期:2021.4.19
bridged azapentacenes display superior photochemical, oxidative and thermal stabilities compared to azapentacenes protected by bis(TIPS‐ethynyl)‐substituents—clipping an azaacene into a large ring is a viable complement in stabilization.
[EN] NOVEL CHIRAL PHOSPHORUS LIGANDS<br/>[FR] NOUVEAUX LIGANDS DE PHOSPHORE CHIRAUX
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2011056737A1
公开(公告)日:2011-05-12
The invention relates to a series of novel chiral phosphorus ligands of formulae (Ia) and (Ib): wherein R, 1 - rR> 4 and X are as defined herein. The invention also relates to chiral metal complexes prepared with these chiral phosphorus ligands. The chiral metal complexes are useful as catalysts for carrying out asymmetric hydro genation.
[EN] PHOSPHORUS LIGANDS AND METHODS OF USE<br/>[FR] LIGANDS PHOSPHORÉS ET PROCÉDÉS D'UTILISATION
申请人:UNIV CALIFORNIA
公开号:WO2016094489A1
公开(公告)日:2016-06-16
In one embodiment, the application discloses ligands, such as a ligand from a dihydrobenzo [1,3] oxaphosphole scaffold, and palladium or other transition metal complexes comprising the ligands and methods for performing cross coupling reactions and asymmetric cross coupling reactions with high selectivity and efficiency, under aqueous micellar catalysis conditions.
Aryne-mediated fluorination: Synthesis of fluorinated biaryls via a sequential desilylation–halide elimination–fluoride addition process
作者:Vincent Diemer、Juan Sanz Garcia、Frédéric R. Leroux、Françoise Colobert
DOI:10.1016/j.jfluchem.2011.02.017
日期:2012.2
An unusual aryne-mediated fluorination of aromatic ring systems during the desilylation of ortho-bromo-biphenyl-trimethylsilanes with tetrabutylammonium fluoride (TBAF) is described. In situ formation of an aryne and addition of fluoride affords fluorinated biphenyls. The structures have been undoubtfully confirmed by synthesis of authentic samples via Suzuki–Miyaura cross-coupling and X-ray analysis