Catalytic Mechanism Study on the 1,2‐ and 1,4‐Transfer Hydrogenation of Ketimines and β‐Enamino Esters Catalyzed by Axially Chiral Biscarboline‐Based Alcohols

2019 ◽  
Vol 361 (19) ◽  
pp. 4602-4610
Author(s):  
Mengxian Dong ◽  
Jie Wang ◽  
Shijie Wu ◽  
Yang Zhao ◽  
Yangyang Ma ◽  
...  
Keyword(s):  
Catalytic Mechanism ◽  
Transfer Hydrogenation ◽  
Mechanism Study ◽  
Axially Chiral

scholarly journals New Bifunctional Bis(azairidacycle) with Axial Chirality via Double Cyclometalation of 2,2′-Bis(aminomethyl)-1,1′-binaphthyl

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1165
Author(s):  
Yasuhiro Sato ◽  
Yuichi Kawata ◽  
Shungo Yasui ◽  
Yoshihito Kayaki ◽  
Takao Ikariya
Keyword(s):  
Hydrogen Transfer ◽  
Bond Cleavage ◽  
Enantiomeric Excess ◽  
Transfer Hydrogenation ◽  
Catalyst Precursor ◽  
Asymmetric Catalysts ◽  
Axially Chiral ◽  
Diastereomeric Mixture ◽  
Raney Ni ◽  
Half Sandwich

As a candidate for bifunctional asymmetric catalysts containing a half-sandwich C–N chelating Ir(III) framework (azairidacycle), a dinuclear Ir complex with an axially chiral linkage is newly designed. An expedient synthesis of chiral 2,2′-bis(aminomethyl)-1,1′-binaphthyl (1) from 1,1-bi-2-naphthol (BINOL) was accomplished by a three-step process involving nickel-catalyzed cyanation and subsequent reduction with Raney-Ni and KBH4. The reaction of (S)-1 with an equimolar amount of [IrCl2Cp*]2 (Cp* = η5–C5(CH3)5) in the presence of sodium acetate in acetonitrile at 80 °C gave a diastereomeric mixture of new dinuclear dichloridodiiridium complexes (5) through the double C–H bond cleavage, as confirmed by 1H NMR spectroscopy. A loss of the central chirality on the Ir centers of 5 was demonstrated by treatment with KOC(CH3)3 to generate the corresponding 16e amidoiridium complex 6. The following hydrogen transfer from 2-propanol to 6 provided diastereomers of hydrido(amine)iridium retaining the bis(azairidacycle) architecture. The dinuclear chlorido(amine)iridium 5 can serve as a catalyst precursor for the asymmetric transfer hydrogenation of acetophenone with a substrate to a catalyst ratio of 200 in the presence of KOC(CH3)3 in 2-propanol, leading to (S)-1-phenylethanol with up to an enantiomeric excess (ee) of 67%.

Atroposelective Transfer Hydrogenation of Biaryl Aminals via Dynamic Kinetic Resolution. Synthesis of Axially Chiral Diamines

ACS Catalysis ◽  
2021 ◽  
pp. 4117-4124
Author(s):  
José A. Carmona ◽  
Carlos Rodríguez-Franco ◽  
Joaquín López-Serrano ◽  
Abel Ros ◽  
Javier Iglesias-Sigüenza ◽  
...  
Keyword(s):  
Kinetic Resolution ◽  
Transfer Hydrogenation ◽  
Dynamic Kinetic Resolution ◽  
Axially Chiral ◽  
Chiral Diamines

A mechanism study on the efficient conversion of cellulose to acetol over Sn–Co catalysts with low Sn content

2020 ◽  
Vol 22 (19) ◽  
pp. 6579-6587
Author(s):  
Xiaohao Liu ◽  
Xiaodong Liu ◽  
Haiyong Wang ◽  
Tianci Xiao ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Catalytic Mechanism ◽  
Mechanism Study ◽  
Cellulose Conversion ◽  
Co Catalysts ◽  
Efficient Conversion

Sn–Co/SiO2 with low Sn content can effectively catalyze cellulose conversion to acetol, but Sn–Ni/SiO2 cannot. The catalytic mechanism was studied systematically.

Activation of persulfate with 3D urchin-like CoO-CuO microparticles for DBP degradation: A catalytic mechanism study

2019 ◽  
Vol 655 ◽  
pp. 614-621 ◽  
Author(s):  
Xiaofeng Zhang ◽  
Qintie Lin ◽  
Haoyu Luo ◽  
Runlin Huang ◽  
Rongbo Xiao ◽  
...  
Keyword(s):  
Catalytic Mechanism ◽  
Mechanism Study

Highly efficient catalytic conversion of cellulose into acetol over Ni–Sn supported on nanosilica and the mechanism study

2019 ◽  
Vol 21 (20) ◽  
pp. 5647-5656 ◽  
Author(s):  
Xiaohao Liu ◽  
Xiaodong Liu ◽  
Guangyue Xu ◽  
Ying Zhang ◽  
Chenguang Wang ◽  
...  
Keyword(s):  
Catalytic Mechanism ◽  
Catalytic Conversion ◽  
Mechanism Study ◽  
One Pot ◽  
Highly Efficient

61.6% yield of acetol was obtained by one pot conversion of cellulose using Ni–Sn/SiO2 catalysts, and the catalytic mechanism was studied.

Catalytic mechanism study on manganese oxide in the catalytic supercritical water oxidation of nitrobenzene

RSC Advances ◽  
2015 ◽  
Vol 5 (59) ◽  
pp. 47488-47497 ◽  
Author(s):  
Xiuqin Dong ◽  
Ya’nan Zhang ◽  
Yongwei Xu ◽  
Minhua Zhang
Keyword(s):  
Manganese Oxide ◽  
Catalytic Oxidation ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Catalytic Mechanism ◽  
Supercritical Water Oxidation ◽  
Mechanism Study ◽  
Oxidizing Agents

MnO2and Mn2O3transform into each other, and the mixture acts as an electron relay to promote the generation of strong oxidizing agents and the catalytic oxidation of nitrobenzene during catalytic supercritical water oxidation.

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