Preparation, Hydrogen Bonds, and Catalytic Activity in Metal-Promoted Addition of Arylboronic Acids to Enones of a Rhodium Complex Containing an NHC Ligand with an Alcohol Function

2012 ◽  
Vol 31 (17) ◽  
pp. 6154-6161 ◽  
Author(s):  
Itziar Peñafiel ◽  
Isidro M. Pastor ◽  
Miguel Yus ◽  
Miguel A. Esteruelas ◽  
Montserrat Oliván
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Bonds ◽  
Rhodium Complex ◽  
Arylboronic Acids

Asymmetric 1,4-Addition of Arylboronic Acids to α,β-Unsaturated Aldehydes Catalyzed by a Chiral Diene–Rhodium Complex

2005 ◽  
Vol 34 (11) ◽  
pp. 1480-1481 ◽  
Author(s):  
Tamio Hayashi ◽  
Norihito Tokunaga ◽  
Kazuhiro Okamoto ◽  
Ryo Shintani
Keyword(s):  
Rhodium Complex ◽  
Arylboronic Acids ◽  
Unsaturated Aldehydes

Chlorido(dimethyl 2,2′-bipyridine-4,4′-dicarboxylate-κ2N,N′)(η5-pentamethylcyclopentadienyl)rhodium(III) chloride 1-hydroxypyrrolidine-2,5-dione disolvate

2013 ◽  
Vol 69 (6) ◽  
pp. 584-587
Author(s):  
Dharmalingam Sivanesan ◽  
Hyung Min Kim ◽  
Yoon Sungho
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Substitution Reaction ◽  
Three Dimensional ◽  
Title Complex ◽  
Rhodium Complex ◽  
Synthetic Route ◽  
Dimensional Network ◽  
Weak Hydrogen Bonds ◽  
Solvent Molecules

The title complex, [Rh(C10H15)Cl(C14H12N2O4)]Cl·2C4H5NO3, has been synthesized by a substitution reaction of the precursor [bis(2,5-dioxopyrrolidin-1-yl) 2,2′-bipyridine-4,4′-dicarboxylate]chlorido(pentamethylcyclopentadienyl)rhodium(III) chloride with NaOCH3. The RhIIIcation is located in an RhC5N2Cl eight-coordinated environment. In the crystal, 1-hydroxypyrrolidine-2,5-dione (NHS) solvent molecules form strong hydrogen bonds with the Cl−counter-anions in the lattice and weak hydrogen bonds with the pentamethylcyclopentadienyl (Cp*) ligands. Hydrogen bonding between the Cp* ligands, the NHS solvent molecules and the Cl−counter-anions form links in a V-shaped chain of RhIIIcomplex cations along thecaxis. Weak hydrogen bonds between the dimethyl 2,2′-bipyridine-4,4′-dicarboxylate ligands and the Cl−counter-anions connect the components into a supramolecular three-dimensional network. The synthetic route to the dimethyl 2,2′-bipyridine-4,4′-dicarboxylate-containing rhodium complex from the [bis(2,5-dioxopyrrolidin-1-yl) 2,2′-bipyridine-4,4′-dicarboxylate]rhodium(III) precursor may be applied to link Rh catalysts to the surface of electrodes.

Dinuclear neodymium and lanthanum bis(2,6-diisopropylphenyl) phosphate complexes bearing a hydroxide ligand: catalytic activity of the Nd complex in 1,3-diene polymerization

2018 ◽  
Vol 74 (6) ◽  
pp. 673-682 ◽  
Author(s):  
Mikhail E. Minyaev ◽  
Sof'ya A. Korchagina ◽  
Alexander N. Tavtorkin ◽  
Andrei V. Churakov ◽  
Ilya E. Nifant'ev
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Bonds ◽  
Molar Ratio ◽  
Vacuum Drying ◽  
Water Molecules ◽  
Nmr Studies ◽  
Space Groups ◽  
Phosphate Complex ◽  
Hydroxide Anion ◽  
Isoprene Polymerization

The reactions of K[(2,6-iPr2C6H3-O)2POO] either with LaCl3(H2O)7 or with Nd(NO3)3(H2O)6 in a 3:1 molar ratio, followed by vacuum drying and recrystallization from alkanes, have led to the formation of diaquapentakis[bis(2,6-diisopropylphenyl) phosphato]-μ-hydroxido-dilanthanum hexane disolvate, [La2(C24H34O4P)5(OH)(H2O)2]·2C6H14, (1)·2(hexane), and tetraaquatetrakis[bis(2,6-diisopropylphenyl) phosphato]-μ-hydroxido-dineodymium bis(2,6-diisopropylphenyl) phosphate heptane disolvate, [Nd2(C24H34O4P)4(OH)(H2O)4]·2C6H14, (2)·2(heptane). The compounds crystalize in the P21/n and P\overline{1} space groups, respectively. The diaryl-substituted organophosphate ligand exhibits three different coordination modes, viz. κ2 O,O′-terminal [in (1) and (2)], κO-terminal [in (1)] and μ2-κ1 O:κ1 O′-bridging [in (1) and (2)]. Binuclear structures (1) and (2) are similar and have the same unique Ln2(μ-OH)(μ-OPO)2 core. The structure of (2) consists of an [Nd2{(2,6-iPr2C6H3-O)2POO}4(OH)(H2O)4]+ cation and a [(2,6-iPr2C6H3-O)2POO]− anion, which are bound via four intermolecular O—H...O hydrogen bonds. The molecular structure of (1) displays two O—H...O hydrogen bonds between OH/H2O ligands and a κ1 O-terminal organophosphate ligand, which resembles, to some extent, the `free' [(2,6-iPr2C6H3-O)2POO]− anion in (2). NMR studies have shown that the formation of (1) undoubtedly occurs due to intramolecular hydrolysis during vacuum drying of the aqueous La tris(phosphate) complex. Catalytic experiments have demonstrated that the presence of the coordinated hydroxide anion and water molecules in precatalyst (2) substantially lowered the catalytic activity of the system prepared from (2) in butadiene and isoprene polymerization compared to the catalytic system based on the neodymium tris[bis(2,6-diisopropylphenyl) phosphate] complex, which contains neither OH nor H2O ligands.

The Rational Design and Synthesis of Water-Soluble Thiourea Ligands for Recoverable Pd-Catalyzed Aerobic Aqueous Suzuki–Miyaura Reactions at Room Temperature

Synthesis ◽  
2018 ◽  
Vol 50 (07) ◽  
pp. 1499-1510 ◽  
Author(s):  
Wei Chen ◽  
Xiao-Yan Lu ◽  
Bei-Hua Xu ◽  
Wei-guo Yu ◽  
Zi-niu Zhou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rational Design ◽  
Pd Nanoparticles ◽  
Water Soluble ◽  
Tem Analysis ◽  
Arylboronic Acids ◽  
Design And Synthesis ◽  
Black Precipitate ◽  
Aryl Bromides ◽  
Carboxylic Groups

Eight precatalysts containing carboxylic-functionalized thiourea ligands are prepared and their activities and recyclability are evaluated in aerobic aqueous Suzuki–Miyaura reactions. A bulky monothiourea–Pd complex, functionalized with four carboxylic groups, shows the best activity and recyclability in the coupling of aryl bromides with arylboronic acids. The catalyst can be reused at least five times without any significant reduction in its catalytic activity. TEM analysis and the confirmed catalytic activity of the observed black precipitate reveal that Pd nanoparticles are formed during the reactions and are stabilized by the carboxylic-functionalized thiourea ligands.

Synthesis, Characterization, and Catalytic Activity of Heteroleptic Rhodium Complex for C–N Couplings

2019 ◽  
Vol 45 (1) ◽  
pp. 62-73 ◽  
Author(s):  
M. N. Zafar ◽  
Fouzia Perveen ◽  
A. Naz ◽  
Ehsan Ullah Mughal ◽  
Gul-e-Saba ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rhodium Complex
Sign in / Sign up

Export Citation Format

Share Document