New oxidovanadium(iv) complex with a BIAN ligand: synthesis, structure, redox properties and catalytic activity

2018 ◽  
Vol 42 (19) ◽  
pp. 16200-16210 ◽  
Author(s):  
Iakov S. Fomenko ◽  
Artem L. Gushchin ◽  
Lidia S. Shul’pina ◽  
Nikolay S. Ikonnikov ◽  
Pavel A. Abramov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carboxylic Acid ◽  
Catalytic System ◽  
Redox Properties ◽  
Saturated Hydrocarbons ◽  
Ligand Synthesis

The combination of a new oxidovanadium(iv) complex1with pyrazine-2-carboxylic acid (PCA; a cocatalyst) affords a catalytic system for the efficient oxidation of saturated hydrocarbons.

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.

scholarly journals Ring-Opening Copolymerization of Cyclohexene Oxide and Cyclic Anhydrides Catalyzed by Bimetallic Scorpionate Zinc Catalysts

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1651
Author(s):  
Felipe de la Cruz-Martínez ◽  
Marc Martínez de Sarasa Buchaca ◽  
Almudena del Campo-Balguerías ◽  
Juan Fernández-Baeza ◽  
Luis F. Sánchez-Barba ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Mechanism ◽  
Catalytic System ◽  
Phthalic Anhydride ◽  
Ring Opening ◽  
High Selectivity ◽  
Zinc Complexes ◽  
Cyclohexene Oxide ◽  
Reaction Conditions ◽  
Cyclic Anhydrides

The catalytic activity and high selectivity reported by bimetallic heteroscorpionate acetate zinc complexes in ring-opening copolymerization (ROCOP) reactions involving CO2 as substrate encouraged us to expand their use as catalysts for ROCOP of cyclohexene oxide (CHO) and cyclic anhydrides. Among the catalysts tested for the ROCOP of CHO and phthalic anhydride at different reaction conditions, the most active catalytic system was the combination of complex 3 with bis(triphenylphosphine)iminium as cocatalyst in toluene at 80 °C. Once the optimal catalytic system was determined, the scope in terms of other cyclic anhydrides was broadened. The catalytic system was capable of copolymerizing selectively and efficiently CHO with phthalic, maleic, succinic and naphthalic anhydrides to afford the corresponding polyester materials. The polyesters obtained were characterized by spectroscopic, spectrometric, and calorimetric techniques. Finally, the reaction mechanism of the catalytic system was proposed based on stoichiometric reactions.

Templated Synthesis of Pr-Doped Ceria with Improved Micro and Mesoporosity Porosity, Redox Properties and Catalytic Activity

2017 ◽  
Vol 148 (1) ◽  
pp. 258-266 ◽  
Author(s):  
Arantxa Davó-Quiñonero ◽  
Jorge González-Mira ◽  
Dolores Lozano-Castelló ◽  
Agustín Bueno-López
Keyword(s):  
Catalytic Activity ◽  
Redox Properties ◽  
Doped Ceria ◽  
Templated Synthesis

Third-phase catalytic activity of halogen exchange reactions in phase transfer catalytic system

1997 ◽  
Vol 52 (20) ◽  
pp. 3511-3520 ◽  
Author(s):  
Tadaatsu Ido ◽  
Takanobu Yamamoto ◽  
Gong Jin ◽  
Shigeo Goto
Keyword(s):  
Catalytic Activity ◽  
Catalytic System ◽  
Phase Transfer ◽  
Exchange Reactions ◽  
Third Phase ◽  
Halogen Exchange

A novel Nb2S4 complex with a dithiophosphinate ligand: Synthesis, structure and redox properties

Polyhedron ◽  
2019 ◽  
Vol 158 ◽  
pp. 458-463 ◽  
Author(s):  
Artem L. Gushchin ◽  
Alexander V. Rogachev ◽  
Iakov S. Fomenko ◽  
Nikolay F. Romashev ◽  
Vladimir A. Nadolinny ◽  
...  
Keyword(s):  
Redox Properties ◽  
Ligand Synthesis

scholarly journals Effects of Coordination Ability of Nitrogen-Containing Carboxylic Acid Ligands on Nieuwland Catalyst

Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 337 ◽  
Author(s):  
Yanhe You ◽  
Juan Luo ◽  
Jianwei Xie ◽  
Jinli Zhang ◽  
Bin Dai
Keyword(s):  
Catalytic Activity ◽  
Carboxylic Acid ◽  
Iminodiacetic Acid ◽  
Catalyst System ◽  
Excellent Performance ◽  
Coordination Ability ◽  
Cu Ions

This article investigated the effect of three nitrogen-containing carboxylic acid ligands for the Nieuwland catalyst system. The catalyst system containing 4.5% N-(2-acetamido) iminodiacetic acid exhibited improved catalytic activity with excellent performance. The yield of monovinylacetylene (MVA) was maintained at 36.7% after 24 h, which was increased by 17.1% relative to the Nieuwland catalyst system. Based on a variety of analyses on the crystals precipitated from the catalyst solutions, it can be inferred that the outstanding performance and lifetime of the catalysts were related to the abilities of these ligands to form strong coordination with Cu+ ions and stabilize them.

Epoxides as Dual-Functionalized Alkylating Reagents in Catellani Reactions for the Assembly of Heterocycles

Synlett ◽  
2020 ◽  
Vol 31 (09) ◽  
pp. 829-837 ◽  
Author(s):  
Hong-Gang Cheng ◽  
Qianghui Zhou ◽  
Chenggui Wu
Keyword(s):  
Carboxylic Acid ◽  
Catalytic System ◽  
Potassium Salt ◽  
Salient Features ◽  
Alkylating Reagents ◽  
Straightforward Approach

Reported is a cooperative catalytic system consisting of a complex of Pd with dicyclohexyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine (XPhos) and the potassium salt of 5-norbornene-2-carboxylic acid that permits the use of epoxides as dual-functionalized alkylating reagents in Catellani-type reactions for the assembly of heterocycles. Salient features of this research include readily available substrates, use of the potassium salt of 5-norbornene-2-carboxylic acid as a catalytic mediator as well as a base, and excellent regioselectivity for the cleavage of epoxides. This mild, chemoselective, scalable, atom- and step-economic protocol offers a straightforward approach for the assembly of isochroman and 2,3-dihydrobenzofuran scaffolds.

Neodymium dihalide complexes with a tridentate amidinate phosphine oxide ligand: synthesis, structure, and catalytic activity in isoprene polymerization

2019 ◽  
Vol 68 (1) ◽  
pp. 32-39
Author(s):  
A. O. Tolpygin ◽  
O. A. Linnikova ◽  
T. A. Kovylina ◽  
A. V. Cherkasov ◽  
G. K. Fukin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Phosphine Oxide ◽  
Ligand Synthesis ◽  
Isoprene Polymerization
Sign in / Sign up

Export Citation Format

Share Document