A highly active chiral (S,S)-bis(oxazoline) Pd(ii) alkyl complex/activator catalytic system for vinyl polymerization of norbornene in air and water

2017 ◽  
Vol 8 (7) ◽  
pp. 1217-1222 ◽  
Author(s):  
Yingda Huang ◽  
Jianyun He ◽  
Zhanxiong Liu ◽  
Guilong Cai ◽  
Shaowen Zhang ◽  
...  
Keyword(s):  
High Activity ◽  
Catalytic System ◽  
Technical Grade ◽  
Alkyl Complexes ◽  
Vinyl Polymerization ◽  
Highly Active ◽  
Norbornene Polymerization ◽  
Borate Systems

The air/water-tolerant chiral Pd alkyl complexes/borate systems promote the norbornene polymerization both in air and water using unpretreated technical grade solvent and monomer with extremely high activity up to 1.7 × 109 g PNB per molPd per h.

scholarly journals A highly active and thermally stable 6,13-dihydro-6,13-ethanopentacene-15,16-diimine nickel(ii) complex as catalyst for norbornene polymerization

RSC Advances ◽  
2017 ◽  
Vol 7 (82) ◽  
pp. 51858-51863 ◽  
Author(s):  
Ping Huo ◽  
Jingbo Li ◽  
Wanyun Liu ◽  
Guangquan Mei ◽  
Xiaohui He
Keyword(s):  
Thermal Stability ◽  
High Activity ◽  
Nickel Catalyst ◽  
Thermally Stable ◽  
Good Thermal Stability ◽  
Highly Active ◽  
Polycyclic Aromatic ◽  
Aromatic Systems ◽  
Norbornene Polymerization

A nickel catalyst with polycyclic aromatic systems on the backbone exhibits good thermal stability and high activity in norbornene copolymerization.

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.

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.

La-doped Al2O3 supported Au nanoparticles: highly active and selective catalysts for PROX under PEMFC operation conditions

2014 ◽  
Vol 50 (21) ◽  
pp. 2721-2724 ◽  
Author(s):  
Qingquan Lin ◽  
Botao Qiao ◽  
Yanqiang Huang ◽  
Lin Li ◽  
Jian Lin ◽  
...  
Keyword(s):  
High Activity ◽  
Au Nanoparticles ◽  
Co Adsorption ◽  
Operation Conditions ◽  
Highly Active ◽  
La Doped

LaAlO3-doped γ-Al2O3 supported Au catalysts show high activity and selectivity by strengthening CO adsorption meanwhile significantly decreasing H2 oxidation.

Limiting factors for photochemical charge separation in BiVO4/Co3O4, a highly active photocatalyst for water oxidation in sunlight

2014 ◽  
Vol 2 (24) ◽  
pp. 9405-9411 ◽  
Author(s):  
Jiarui Wang ◽  
Frank E. Osterloh
Keyword(s):  
High Activity ◽  
Water Oxidation ◽  
Charge Separation ◽  
Limiting Factors ◽  
Electrocatalytic Properties ◽  
Highly Active

The high activity of BiVO4/Co3O4 was attributed to the electrocatalytic properties of the Co3O4 cocatalyst and to the formation of a heterojunction at the BiVO4–Co3O4 interface.

scholarly journals Cu nanoparticles immobilized on montmorillonite by biquaternary ammonium salts: a highly active and stable heterogeneous catalyst for cascade sequence to indole-2-carboxylic esters

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 13754-13759 ◽  
Author(s):  
Wencheng Lang ◽  
Qin Yang ◽  
Xueping Song ◽  
Mengyun Yin ◽  
Limei Zhou
Keyword(s):  
High Activity ◽  
Heterogeneous Catalyst ◽  
Ammonium Salts ◽  
Cu Nanoparticles ◽  
Highly Active ◽  
Modified Montmorillonite ◽  
Carboxylic Esters

Cu-Q-MMT catalyst was prepared by immobilizing Cu nanoparticals on the biquaternary ammonium salts modified montmorillonite and exhibited high activity for cascade sequence to indole-2-carboxylic esters.

Bimetallic aluminum alkyl complexes as highly active initiators for the polymerization of ε-caprolactone

2011 ◽  
Vol 40 (43) ◽  
pp. 11378 ◽  
Author(s):  
Wenyi Li ◽  
Wenting Wu ◽  
Yaorong Wang ◽  
Yingming Yao ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Aluminum Alkyl ◽  
Alkyl Complexes ◽  
Highly Active

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.

Sign in / Sign up

Export Citation Format

Share Document