CS2activation at uranium(iii) siloxide ate complexes: the effect of a Lewis acidic site

2015 ◽  
Vol 44 (6) ◽  
pp. 2650-2656 ◽  
Author(s):  
Clément Camp ◽  
Oliver Cooper ◽  
Julie Andrez ◽  
Jacques Pécaut ◽  
Marinella Mazzanti
Keyword(s):  
Acidic Site ◽  
Reductive Dimerization ◽  
Lewis Acidic Site

Multimetallic cooperativity plays an important role in U(iii) mediated CS2reduction: the reductive dimerization of CS2occurs preferentially at a heterodimetallic U, K complex while the reductive disproportionation pathway is favoured by the “ate” complex [K(18c6)][U(OSi(OtBu)3)4].

Hydrogenation of pentenal over supported Pt nanoparticles: influence of Lewis-acid sites in the conversion pathway

2021 ◽  
Author(s):  
Xuejiao Wei ◽  
Yajuan Zhou ◽  
Xiaonan Sun ◽  
Fuhua Jiang ◽  
Jintao Zhang ◽  
...  
Keyword(s):  
Surface Properties ◽  
Lewis Acid ◽  
High Selectivity ◽  
Pt Nanoparticles ◽  
Acid Sites ◽  
Electron Acceptors ◽  
Acidic Site ◽  
Lewis Acid Sites ◽  
Lewis Acidic Site

The superb TOF and high selectivity of Pt/CeAl are associated with the surface properties (e.g. medium Lewis acidic site). The unsaturated Ce4+/Al3+ cations pairs act as the acid sites and electron acceptors to polarize the CO bonds.

scholarly journals Selective 5-Hydroxymethylfurfural Hydrogenolysis to 2,5-Dimethylfuran over Bimetallic Pt-FeOx/AC Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 915
Author(s):  
Yongjie Xin ◽  
Sichan Li ◽  
Haiyong Wang ◽  
Lungang Chen ◽  
Shuang Li ◽  
...  
Keyword(s):  
Critical Role ◽  
Incipient Wetness Impregnation ◽  
Acidic Site ◽  
Reaction Conditions ◽  
Site Density ◽  
Lewis Acidic Site ◽  
Reduction Of Iron ◽  
Structures And Properties ◽  
Selective Hydrogenolysis ◽  
Optimal Reaction

The selective hydrogenolysis of 5-hydroxymethylfurfural (HMF) platform molecule to 2,5-dimethylfuran (DMF) has attracted increasing attention due to its broad range of applications. However, HMF, with multiple functional groups, produces various byproducts, hindering its use on an industrial scale. Herein, a bimetallic Pt-FeOx/AC catalyst with low Pt and FeOx loadings for selective HMF hydrogenolysis to DMF was prepared by incipient wetness impregnation. The structures and properties of different catalysts were characterized by XRD, XPS, TEM, ICP-OES and Py-FTIR techniques. The addition of FeOx enhanced Pt dispersion and the Lewis acidic site density of the catalysts, and was found to be able to inhibit C=C hydrogenation, thereby im-proving DMF yield. Moreover, the presence of Pt promoted the reduction of iron oxide, creating a strong interaction between Pt and FeOx. This synergistic effect originated from the activation of the C–O bond over FeOx species followed by hydrogenolysis over the adjacent Pt, and played a critical role in hydrogenolysis of HMF to DMF, achieving a yield of 91% under optimal reaction conditions. However, the leaching of Fe species caused a metal–acid imbalance, which led to an increase in ring hydrogenation products.

Integration of metalloporphyrin into cationic covalent triazine frameworks for the synergistically enhanced chemical fixation of CO2

2020 ◽  
Vol 10 (23) ◽  
pp. 8026-8033
Author(s):  
Qiu-Jin Wu ◽  
Min-Jie Mao ◽  
Jian-Xin Chen ◽  
Yuan-Biao Huang ◽  
Rong Cao
Keyword(s):  
Chemical Fixation ◽  
Cyclic Carbonates ◽  
Acidic Site ◽  
Cobalt Porphyrin ◽  
Lewis Acidic Site

Cobalt porphyrin as a Lewis acidic site was integrated into imidazolium-functionalized porous cationic covalent triazine frameworks for the cooperatively enhanced catalysis CO2 cycloaddition to produce cyclic carbonates.

scholarly journals Zinc-mediated Reductive Dimerization Cyclization of Ethyl Arylmethylidenecyanoacetates in Aqueous Media

1999 ◽  
Vol 23 (7) ◽  
pp. 448-449
Author(s):  
Lei Wang ◽  
Yongmin Zhang
Keyword(s):  
Aqueous Media ◽  
Major Product ◽  
Trans Form ◽  
Reductive Dimerization

Zinc-mediated reductive dimerization–cyclization of ethyl arylmethylidenecyanoacetates occurs to give diethyl 2-amino-3-cyano-4,5-diaryl-1,3-cyclopentenedicarboxylates in moderate to good yields the trans, trans-form isomer being the major product.

scholarly journals Continuous flow synthesis of azoxybenzenes by reductive dimerization of nitrosobenzenes with gel‐bound catalysts

2021 ◽  
Author(s):  
Carsten J. Schmiegel ◽  
Patrik Berg ◽  
Franziska Obst ◽  
Roland Schoch ◽  
Dietmar Appelhans ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Flow Synthesis ◽  
Reductive Dimerization

Reductive dimerization of propiophenone

1989 ◽  
Vol 23 (5) ◽  
pp. 434-435
Author(s):  
V. A. Zolotareva ◽  
G. G. Malanina ◽  
L. I. Klimova ◽  
G. S. Grinenko
Keyword(s):  
Reductive Dimerization

Metal-Induced C?C Coupling by Reductive Dimerization of Thioaroyl Groups

1983 ◽  
Vol 22 (12) ◽  
pp. 996-997 ◽  
Author(s):  
Ekkehard Lindner ◽  
Ingobert P. Butz ◽  
Wolfgang Hiller ◽  
Raid Fawzi ◽  
Sigurd Hoehne
Keyword(s):  
Reductive Dimerization

Nickel-Catalyzed Reductive Dimerization of Alkyl Halides

Synfacts ◽  
2010 ◽  
Vol 2010 (11) ◽  
pp. 1293-1293
Author(s):  
D. Weix ◽  
M. Prinsell ◽  
D. Everson
Keyword(s):  
Alkyl Halides ◽  
Reductive Dimerization
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