Category: 138984-26-6

Application of 138984-26-6. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about Cyclization of diazoacetamides catalyzed by N-heterocyclic carbene dirhodium(II) complexes. Author is Gomes, Luis F. R.; Trindade, Alexandre F.; Candeias, Nuno R.; Veiros, Luis F.; Gois, Pedro M. P.; Afonso, Carlos A. M..

The axial coordination of N-heterocyclic carbene ligands onto dirhodium(II) complexes was examined, together with its role in the intramol. C-H insertion reactions of α-diazoacetamides. The formation of a decarbonylated product occurs by a free-carbene mechanism in which the structures of the catalyst and the acetamide play a decisive role.

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Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 138984-26-6, is researched, SMILESS is C12=O[Rh+2]3(O=C4[N-]5CCCCC4)([N-]6C(CCCCC6)=O7)[N-](CCCCC8)C8=O[Rh+2]357[N-]1CCCCC2, Molecular C24H40N4O4Rh2Journal, Tetrahedron called Selective arylation of aldehydes with di-rhodium(II)/NHC catalysts, Author is Trindade, Alexandre F.; Andre, Vania; Duarte, M. Teresa; Veiros, Luis F.; Gois, Pedro M. P.; Afonso, Carlos A. M., the main research direction is selective arylation aldehyde rhodium NHC catalyst ab initio.Related Products of 138984-26-6.

Here is described the preparation of four new rhodium(II) complexes bearing axial NHC ligands. The presence of electron-withdrawing bridging ligands resulted in an enhanced reactivity in the arylation of aldehydes with boronic acids when compared with the tetraacetate counterparts. Complex (Rh2tfa4(IPr)2) proved to be the most active catalyst for this transformation allowing the selective conversion of aromatic, aliphatic and vinyl aldehydes into the resp. alcs. in excellent yields. It was demonstrated that the good group tolerance could be further extended to aromatic and conjugated ketones. DFT calculations carried out on this system showed the complementarily of the bridging ligands and axial ligand in these dinuclear complexes. It was also disclosed that Rh(II)/NHC catalytic system can promote the racemization of 1-Ph ethanol.

The article 《Selective arylation of aldehydes with di-rhodium(II)/NHC catalysts》 also mentions many details about this compound(138984-26-6)Related Products of 138984-26-6, you can pay attention to it, because details determine success or failure

Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Axial Coordination of NHC Ligands on Dirhodium(II) Complexes: Generation of a New Family of Catalysts, published in 2008-06-06, which mentions a compound: 138984-26-6, mainly applied to axial coordination NHC ligand dirhodium complex generation catalyst crystallog, Recommanded Product: Dirhodium(II) tetrakis(caprolactam).

An efficient new methodol. for the arylation of aldehydes is disclosed which uses dirhodium(II) catalysts and N-heterocyclic carbene (NHC) ligands. Complexes of Rh2(OAc)4 with one and two NHCs attached on the axial positions were successfully isolated, fully characterized, and used as catalysts in the reaction. A saturated monocomplex is the most active catalyst and was particularly efficient in the arylation of alkyl aldehydes. DFT calculations support participation of complexes with one axial NHC in the reaction as the catalysts active species and indicate that hydrogen bonds involving dirhodium unit, reactants, and solvent (alc.) play an important role on the reaction mechanism.

The article 《Axial Coordination of NHC Ligands on Dirhodium(II) Complexes: Generation of a New Family of Catalysts》 also mentions many details about this compound(138984-26-6)Recommanded Product: Dirhodium(II) tetrakis(caprolactam), you can pay attention to it, because details determine success or failure

Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Carbene-Mediated Functionalization of the Anomeric C-H Bond of Carbohydrates: Scope and Limitations》. Authors are Boultadakis-Arapinis, Melissa; Prost, Elise; Gandon, Vincent; Lemoine, Pascale; Turcaud, Serge; Micouin, Laurent; Lecourt, Thomas.The article about the compound:Dirhodium(II) tetrakis(caprolactam)cas:138984-26-6,SMILESS:C12=O[Rh+2]3(O=C4[N-]5CCCCC4)([N-]6C(CCCCC6)=O7)[N-](CCCCC8)C8=O[Rh+2]357[N-]1CCCCC2).Category: ruthenium-catalysts. Through the article, more information about this compound (cas:138984-26-6) is conveyed.

Herein we investigate the scope and limitations of a new synthetic approach towards α- and β-ketopyranosides relying on the functionalization of the anomeric C-H bond of carbohydrates by insertion of a metal carbene. A key bromoacetate grafted at the 2-position is the cornerstone of a stereoselective glycosylation/diazo-transfer/quaternization sequence that makes possible the construction of a quaternary center with complete control of the stereochem. This sequence shows a good tolerance toward protecting groups commonly used in carbohydrate chem. and gives rise to quaternary disaccharides, e.g. I, with good efficiency. In the case of a disaccharide with a more restricted conformation, this functionalization process can be hampered by the steric demand next to the targeted anomeric position. In addition, the formation of transient orthoesters during the glycosylation step may also reduce the overall efficiency of the synthetic sequence.

After consulting a lot of data, we found that this compound(138984-26-6)Category: ruthenium-catalysts can be used in many types of reactions. And in most cases, this compound has more advantages.

Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Senthilkumar, Soundararasu; Valdomir, Guillermo; Ganapathy, Dhandapani; Zhang, Yun; Tietze, Lutz F. published an article about the compound: Dirhodium(II) tetrakis(caprolactam)( cas:138984-26-6,SMILESS:C12=O[Rh+2]3(O=C4[N-]5CCCCC4)([N-]6C(CCCCC6)=O7)[N-](CCCCC8)C8=O[Rh+2]357[N-]1CCCCC2 ).Recommanded Product: 138984-26-6. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:138984-26-6) through the article.

An enantioselective total synthesis of blennolide D (I) and the enantiomers of blennolide E (II) and F (III) is described using an enantioselective Wacker-type oxidation followed by the formation of the lactone moiety. For the introduction of the hydroxyl group in the γ-lactone, a TEMPO-mediated α-oxygenation was used which was followed by a benzylic oxidation and deprotection to give the desired compounds In addition, an unknown diastereomer was synthesized.

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Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Safety of Dirhodium(II) tetrakis(caprolactam). The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about The Oxidative Mannich Reaction Catalyzed by Dirhodium Caprolactamate. Author is Catino, Arthur J.; Nichols, Jason M.; Nettles, Brian J.; Doyle, Michael P..

Dirhodium caprolactamate [Rh2(cap)4] is a highly effective catalyst for the oxidative Mannich reaction of tertiary amines with siloxyfurans to provide γ-aminoalkyl butenolides, e.g., I. The reaction proceeds via C-H oxidation of a tertiary amine followed by nucleophilic capture. This green transformation is conducted in protic solvent using inexpensive T-HYDRO (70% t-BuOOH in water).

After consulting a lot of data, we found that this compound(138984-26-6)Safety of Dirhodium(II) tetrakis(caprolactam) can be used in many types of reactions. And in most cases, this compound has more advantages.

Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Application In Synthesis of Dirhodium(II) tetrakis(caprolactam). The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about Macrocyclic oxonium ylide formation and internal [2,3]-sigmatropic rearrangement. Catalyst influence on selectivity. Author is Doyle, Michael P.; Peterson, Chad S..

The formation of 13-membered ring oxonium ylides and their subsequent stereocontrolled [2,3]-sigmatropic rearrangement to 10-membered ring lactones, e.g., I, occurs in catalyst-dependent competition with macrocyclic cyclopropanation.

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Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about Electronic and steric control in carbon-hydrogen insertion reactions of diazoacetoacetates catalyzed by dirhodium(II) carboxylates and carboxamides, the main research direction is diazoacetoacetate insertion intramol rhodium catalyst; regioselective insertion catalyst dirhodium carboxylate carboxamide; mol mechanic calculation diazoacetoacetate insertion; transition state structure diazoacetoacetate insertion; lactone gamma; THF oxo.Application of 138984-26-6.

Carboxylate and carboxamide ligands on dirhodium(II) catalysts can provide enormous regiocontrol in carbon-hydrogen insertion reactions of diazoacetate esters. Whereas 2,3,4-trimethyl-3-pentyl diazoacetoacetate forms γ-lactone products from insertion into primary and tertiary C-H bonds in a statistical distribution (61:39) with dirhodium(II) tetrakis(perfluorobutyrate), only tertiary C-H insertion is observed with dirhodium(II) tetraacetamide. Similar results are obtained with 2-methyl-2-octyl diazoacetoacetate, where competition for insertion exists between secondary and primary C-H bonds and electronic factors govern regioselection. However, with 2-methyl-3-isopropyl-3-heptyl diazoacetoacetate (2) and 2-methyl-1-phenyl-2-Pr diazoacetoacetate (4), product distributions from C-H insertion are invariant with the dirhodium(II) ligands; insertion into a secondary C-H bond is favored over tertiary C-H insertion with 2 (95:5), and insertion into a primary C-H bond is preferred to benzylic secondary C-H insertion with 4 (70:30). In such cases, which are amenable to analyses by MM2 calculations, regioselectivity is determined by conformational preferences for which C-H insertion selectivity can be as random as that found with 2 and 4. When only one C-H bond site is available for insertion to form a five-membered ring product, only one γ-lactone is observed from reactions catalyzed by dirhodium(II) tetraacetate, and that product is not necessarily the one predicted by presumed electronic preferences.

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Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 138984-26-6, is researched, Molecular C24H40N4O4Rh2, about Study of substrate dependence on the diastereoselectivity of the ruthenium(II) porphyrin catalyzed tandem formation and 1,3-dipolar cycloaddition reactions of carbonyl ylides, the main research direction is stereoselective synthesis dipolar cycloaddition diazo ketone dipolarophile ruthenium porphyrin; oxabicyclooctenone derivative preparation diazo ketone alkene ruthenium porphyrin catalyst; azatricycloundecanone derivative preparation diazo ketone alkene ruthenium porphyrin catalyst; carbonyl ylide formation diazo ketone ruthenium porphyrin.Application of 138984-26-6.

The effect of substrate substitution on reaction selectivity for the ruthenium(II) porphyrin catalyzed tandem carbonyl ylide formation/1,3-dipolar cycloaddition reaction of a variety of alkyl and aryl substituted α-diazo ketones, e.g. I, with π-unsaturated compounds, e.g. II, to give various cycloadducts, e.g. III, was examined The results suggested the diastereoselectivity of the reaction to be highly substrate dependant. Similar yields and cis/trans selectivities have also been achieved for the analogous reactions with rhodium(II,II) dimer as catalyst.

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Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Category: ruthenium-catalysts. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about Control of the Chemoselectivity of Metal N-Aryl Nitrene Reactivity: C-H Bond Amination versus Electrocyclization. Author is Kong, Chen; Jana, Navendu; Jones, Crystalann; Driver, Tom G..

A mechanism study to identify the elements that control the chemoselectivity of metal-catalyzed N-atom transfer reactions of styryl azides is presented. Our studies show that the proclivity of the metal N-aryl nitrene to participate in sp3-C-H bond amination or electrocyclization reactions can be controlled by either the substrate or the catalyst. Electrocyclization is favored for mono-β-substituted and sterically noncongested styryl azides, whereas sp3-C-H bond amination through an H-atom abstraction-radical recombination mechanism is preferred when a tertiary allylic reaction center is present. Even when a weakened allylic C-H bond is present, our data suggest that the indole is still formed through an electrocyclization instead of a common allyl radical intermediate. The site selectivity of metal N-aryl nitrenes was found to be controlled by the choice of catalyst: Ir(I)-alkene complexes trigger electrocyclization processes while Fe(III) porphyrin complexes catalyze sp3-C-H bond amination in substrates where Rh2(II) carboxylate catalysts provide both products.

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Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI