Soluble amphiphilic tannin-stabilized Pd(0) nanoparticles: a highly active and selective homogeneous catalyst used in a biphasic catalytic system

2009 ◽  
pp. 4687 ◽  
Author(s):  
Xin Huang ◽  
Yanping Wang ◽  
Xuepin Liao ◽  
Bi Shi
Keyword(s):  
Catalytic System ◽  
Homogeneous Catalyst ◽  
Highly Active ◽  
Biphasic Catalytic System

Deactivation of arenetitanium(II) bromoalane complexes in the cyclotrimerization of butadiene

1986 ◽  
Vol 51 (12) ◽  
pp. 2751-2759 ◽  
Author(s):  
Jindřich Poláček ◽  
Helena Antropiusová ◽  
Lidmila Petrusová ◽  
Karel Mach
Keyword(s):  
Catalytic Activity ◽  
Catalytic System ◽  
Model System ◽  
Highly Active ◽  
Catalytic Stability

The C6H6.Ti(II)(AlBr4)2 (Ib) catalyst deactivates during the butadiene cyclotrimerization to give a solid containing all titanium (mostly as TiBr3) and a mixture of AlBr3 and RAlBr2 compounds dissolved in benzene. The residual cationic catalytic activity of the deactivated Ib system is due to presence of AlBr3. In contrast to TiCl3, the deactivated Ib system and the model system TiBr3 + AlBr3 are not activated by the addition of EtAlCl2 in the presence of butadiene: the highly active benzenetitanium(II) system is re-constituted only after reduction of TiBr3 with Et3Al followed by the addition of EtAlCl2. The addition of Et2AlBr to Ib accelerates the deactivation of the system. Deactivation products of this system contain mainly Ti(II) species which forms benzenetitanium(II) catalytic system after addition of EtAlCl2. All the EtAlCl2 reactivated systems produce (Z, E, E)-1,5,9-cyclododecatriene with high catalytic stability and considerable selectivity (>90%). This behaviour points to the catalysis by benzenetitanium(II) chloroalane complexes containing only low amount of bromine atoms and ethyl groups.

Sodium complexes bearing cavity-like conformations: a highly active and well-controlled catalytic system for macrolactone homo- and copolymerization

2021 ◽  
Vol 12 (13) ◽  
pp. 1957-1966
Author(s):  
Xinya Wang ◽  
Xiaohua Wang ◽  
Nuo Zhen ◽  
Jin Gu ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Catalytic System ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Highly Active ◽  
Sodium Complexes

Sodium complexes displaying cavity-like conformations and, therefore, suppressed transesterification during the ring-opening polymerization of pentadecalactone are disclosed herein.

An All-Inorganic, Stable, and Highly Active Tetraruthenium Homogeneous Catalyst for Water Oxidation

2008 ◽  
Vol 47 (21) ◽  
pp. 3896-3899 ◽  
Author(s):  
Yurii V. Geletii ◽  
Bogdan Botar ◽  
Paul Kögerler ◽  
Daniel A. Hillesheim ◽  
Djamaladdin G. Musaev ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Homogeneous Catalyst ◽  
Highly Active

Elucidation of the Structure of a Highly Active Catalytic System for CO2/Epoxide Copolymerization: A salen-Cobaltate Complex of an Unusual Binding Mode

2009 ◽  
Vol 48 (21) ◽  
pp. 10455-10465 ◽  
Author(s):  
Sung Jae Na ◽  
Sujith S ◽  
Anish Cyriac ◽  
Bo Eun Kim ◽  
Jina Yoo ◽  
...  
Keyword(s):  
Catalytic System ◽  
Binding Mode ◽  
Highly Active

scholarly journals Ruthenium-Based Catalytic Systems Incorporating a Labile Cyclooctadiene Ligand with N-Heterocyclic Carbene Precursors for the Atom-Economic Alcohol Amidation Using Amines

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2413 ◽  
Author(s):  
Cheng Chen ◽  
Yang Miao ◽  
Kimmy De Winter ◽  
Hua-Jing Wang ◽  
Patrick Demeyere ◽  
...  
Keyword(s):  
Catalytic System ◽  
High Resolution Mass Spectrometry ◽  
Amide Bond ◽  
Catalyst Loading ◽  
Catalytic Systems ◽  
Amide Bond Formation ◽  
Highly Active ◽  
Metal Catalyzed ◽  
Ru Species

Transition-metal-catalyzed amide-bond formation from alcohols and amines is an atom-economic and eco-friendly route. Herein, we identified a highly active in situ N-heterocyclic carbene (NHC)/ruthenium (Ru) catalytic system for this amide synthesis. Various substrates, including sterically hindered ones, could be directly transformed into the corresponding amides with the catalyst loading as low as 0.25 mol.%. In this system, we replaced the p-cymene ligand of the Ru source with a relatively labile cyclooctadiene (cod) ligand so as to more efficiently obtain the corresponding poly-carbene Ru species. Expectedly, the weaker cod ligand could be more easily substituted with multiple mono-NHC ligands. Further high-resolution mass spectrometry (HRMS) analyses revealed that two tetra-carbene complexes were probably generated from the in situ catalytic system.

Studies on 1-dodecene hydroformylation in biphasic catalytic system containing mixed micelle

2003 ◽  
Vol 194 (1-2) ◽  
pp. 13-17 ◽  
Author(s):  
Min Li ◽  
Yaozhong Li ◽  
Hua Chen ◽  
Yu-e He ◽  
Xianjun Li
Keyword(s):  
Catalytic System ◽  
Mixed Micelle ◽  
Biphasic Catalytic System

Long chain olefin hydroformylation in biphasic catalytic system—how the reaction is accelerated

2003 ◽  
Vol 242 (1) ◽  
pp. 85-88 ◽  
Author(s):  
Liangbing Wang ◽  
Hua Chen ◽  
Yu-e He ◽  
Yaozhong Li ◽  
Min Li ◽  
...  
Keyword(s):  
Catalytic System ◽  
Olefin Hydroformylation ◽  
Biphasic Catalytic System ◽  
Long Chain

scholarly journals The effect of the components of the PdCl2/Fe/I2/Py catalytic system on nitrobenzene carbonylation to ethyl N-phenylcarbamate

2005 ◽  
Vol 3 (1) ◽  
pp. 28-39 ◽  
Author(s):  
Jadwiga Skupińska ◽  
Monika Karpińska ◽  
Maria Ołówek ◽  
Teresa Kasprzycka-Guttman
Keyword(s):  
Catalytic System ◽  
Considerable Increase ◽  
Constant Level ◽  
The Other ◽  
Reaction Products ◽  
Highly Active

AbstractThe PdCl2/Fe/I2/Py catalytic system (Py-pyridine), reported to be highly active in the reaction of nitrobenzene carbonylation to ethyl phenylcarbamate was studied. The present paper describes the role of catalyst components and its effect on the activity and selectivity of the catalyst. The increase in the amount of PdCl2 in the system while retaining a constant level of the other catalyst components, results in the increase of both carbamate and aniline yields. The increase in the amount of iron while retaining the other components constant, initially causes an increase in the carbamate yield; however, at Fe: Pd ratios higher than 36, the carbamate yield remains constant. The change in the amount of iron has no effect on the amount of aniline formed in the system. An increase in the amount of iodine in the system while retaining the other components constant, results in a decrease in carbamate yield and a considerable increase in the aniline yield of the reaction products.

A Highly Active and Recyclable Catalytic System for CO2/Propylene Oxide Copolymerization

2008 ◽  
Vol 120 (38) ◽  
pp. 7416-7419 ◽  
Author(s):  
Sujith S ◽  
Jae Ki Min ◽  
Jong Eon Seong ◽  
Sung Jea Na ◽  
Bun Yeoul Lee
Keyword(s):  
Catalytic System ◽  
Propylene Oxide ◽  
Highly Active
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