Catalytic Deoxygenation of Amine and Pyridine <i>N</i>-Oxides Using Rhodium PC<sub>carbene</sub>P Pincer Complexes
作者:Hendrik Tinnermann、Simon Sung、Beatrice A. Cala、Hashir J. Gill、Rowan D. Young
DOI:10.1021/acs.organomet.9b00778
日期:2020.3.23
Rhodium PCcarbeneP pincercomplexes 1-L (L = PPh3, PPh2(C6F5), PCy3) readily facilitate deoxygenation of amine and pyridine N-oxides. The resulting complexes exhibit η2-C═O coordination of the resulting keto POP pincerligand. These η2-C═O linkages in the metalloepoxide complexes are readily reduced by isopropyl alcohol and various benzylic alcohols. Thus, efficient catalytic deoxygenation of amine
A simple and efficient method for the deoxygenation of amine N-oxides to corresponding amines is reported using the green and economical reagent phenylboronic acid. Deoxygenation of N,N-dialkylaniline N-oxides, trialkylamine N-oxides and pyridineN-oxides were achieved in good to excellent yields. The reduction susceptible functional groups such as ketone, amide, ester and nitro groups are well tolerated
The present invention provides unimolecular metal complexes having increased activity in the copolymerization of carbon dioxide and epoxides. Also provided are methods of using such metal complexes in the synthesis of polymers. According to one aspect, the present invention provides metal complexes comprising an activating species with co-catalytic activity tethered to a multidentate ligand that is coordinated to the active metal center of the complex.
Redox-state dependent activation of silanes and ammonia with reverse polarity (PC<sub>carbene</sub>P)Ni complexes: electrophilic <i>vs.</i> nucleophilic carbenes
作者:Etienne A. LaPierre、Warren E. Piers、Chris Gendy
DOI:10.1039/c8dt04409k
日期:——
rigidified PCalkylP ligand allowed for the synthesis and characterization of cationic and radical PCCarbeneP nickelcomplexes in which the carbene anchor of the pincer framework is electrophilic rather than nucleophilic. Alpha-hydride abstraction from a (PCalkylP)nickel halide complex readily leads to the cationic carbene complex, which furnishes the radical carbene complex by one electron reduction. The reactivity