Tag: M.W:600-700

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Coelho, Jaime A. S.; Trindade, Alexandre F.; Wanke, Riccardo; Rocha, Bruno G. M.; Veiros, Luis F.; Gois, Pedro M. P.; Pombeiro, Armando J. L.; Afonso, Carlos A. M. researched the compound: Dirhodium(II) tetrakis(caprolactam)( cas:138984-26-6 ).Electric Literature of C24H40N4O4Rh2.They published the article 《N-Heterocyclic Carbene Dirhodium(II) Complexes as Catalysts for Allylic and Benzylic Oxidations》 about this compound( cas:138984-26-6 ) in European Journal of Organic Chemistry. Keywords: azaheterocyclic carbene dirhodium complex catalyst allylic benzylic oxidation. We’ll tell you more about this compound (cas:138984-26-6).

The exptl. conditions (solvent, base, temperature and oxidant) for allylic and benzylic oxidation reactions catalyzed by dirhodium(II)/N-heterocyclic carbene (NHC) complexes were optimized for the first time in this work. The oxidations of cyclohexene and fluorene were used as model reactions. Two optimized exptl. conditions for both types of oxidations were found, which resulted in their ketone [aerobic conditions, 40 °C, 1 equivalent tBuOOH (TBHP)] or tert-Bu peroxide derivatives (anaerobic conditions, 25 °C, 2 equivalent TBHP). The dirhodium(II) complexes undergo a single-electron reversible oxidation by cyclic voltammetry in CH2Cl2, which is assigned to the Rh24+/Rh25+ redox couple at an oxidation potential that is lowered upon sequential axial coordination of further ligands to the Rh-Rh center. The oxidation potential is discussed in terms of the electron-donor character of the NHC ligand, which was shown to act as an effective electron-releaser to the Rh24+ center, and the electrochem. behavior is compared to the observed catalytic activity.

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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Dirhodium(II) tetrakis(caprolactam)(SMILESS: C12=O[Rh+2]3(O=C4[N-]5CCCCC4)([N-]6C(CCCCC6)=O7)[N-](CCCCC8)C8=O[Rh+2]357[N-]1CCCCC2,cas:138984-26-6) is researched.Electric Literature of C24H40N4O4Rh2. The article 《Convergent Total Synthesis of (+)-Mycalamide A》 in relation to this compound, is published in Journal of Organic Chemistry. Let’s take a look at the latest research on this compound (cas:138984-26-6).

The details of a convergent total synthesis of (+)-mycalamide A are described. Yb(OTf)3-TMSCl-catalyzed cross-aldol reaction conditions are used to synthesize the right segment of mycalamide A. In this reaction, an acid-sensitive aldehyde reacts with Me trimethylsilyl dimethylketene acetal without epimerization to provide the desired aldol adduct. Addnl., a tetrahydropyran ring, which is the left segment of mycalamide A, is prepared using a novel one-pot δ-lactone formation methodol. Both segments are constructed from a common starting material, D-mannitol. These segments are then coupled in the presence of BuLi, and the functional groups are transformed to complete the synthesis of (+)-mycalamide A.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Divergent Rhodium-Catalyzed Cyclization Reactions of Enoldiazoacetamides with Nitrosoarenes, published in 2017-07-26, which mentions a compound: 138984-26-6, Name is Dirhodium(II) tetrakis(caprolactam), Molecular C24H40N4O4Rh2, SDS of cas: 138984-26-6.

The first cyclization reactions of enoldiazo compounds with nitrosoarenes have been developed. Under the catalysis of rhodium(II) octanoate, [3+2]-cyclization between enoldiazoacetamides and nitrosoarenes occurred through cleavages of the enol double bond and the amide bond, thus furnishing fully substituted 5-isoxazolone derivatives I [NR2 = piperidino, NMe2, R1 = Ph, 4-ClC6H4, 3-MeOC6H4, 2-MeC6H4, etc., R2 = SiMe2CMe3, Si(CHMe2)2]. Upon changing the catalyst to rhodium(II) caprolactamate, the reaction pathway switched to an unprecedented formal [5+1]-cyclization that provided multifunctionalized 1,3-oxazin-4-ones II with near exclusivity under otherwise identical conditions. Mechanistic studies uncovered distinct catalytic activities and reaction intermediates, which plausibly rationalized the novel reactivity and catalyst-controlled chemodivergence. Furthermore, a mechanism-inspired enantioselective rhodium-catalyzed reaction of γ-substituted enoldiazoacetamide with nitrosobenzene produced highly enantioenriched heterocycle-linked trialkylamine.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
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Mejia-Oneto, Jose M.; Padwa, Albert published the article 《Ligand effects in the Rh(II) catalyzed reaction of α-diazo ketoamides》. Keywords: methanoazepinedione preparation byproduct rhodium catalyzed tandem cyclization cycloaddition; polycycle stereoselective preparation rhodium catalyzed tandem cyclization cycloaddition; dependence chemoselectivity rhodium catalyzed reaction diazo compound ligand; alpha diazo ketoamide rhodium catalyzed intramol tandem cyclization cycloaddition.They researched the compound: Dirhodium(II) tetrakis(caprolactam)( cas:138984-26-6 ).Related Products of 138984-26-6. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:138984-26-6) here.

Dirhodium tetracarboxylate or tetracarboxamide complexes act as catalysts for reactions of α-diazoesters containing amides and pendant alkenes or heterocycles such as I to give either polycycles such as II or methanoazepinediones such as III depending on the ligands present in the rhodium catalysts. In the presence of dirhodium tetrapivaloate, I undergoes intramol. cyclocondensation followed by [3+2] cycloaddition through a carbonyl ylide intermediate to give II as the sole product in 98% yield. In the presence of dirhodium tetrakis(heptafluorobutanoate), reaction of I yields both II in 62% yield and III (likely derived from via C-H insertion of I followed by dealkoxycarboxylation of the intermediate) in 32% yield. Other dirhodium compounds catalyze the intramol. cycloaddition of I to provide II and III with varying levels of chemoselectivity. In the presence of dirhodium tetrapivaloate, the thiophene containing substrate IV undergoes carbonyl ylide formation and intramol. cycloaddition to give the polycycle V in 35% yield, indicating that tethered thiophenes can also undergo tandem cyclization-cycloaddition reactions.

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Dirhodium(II) tetrakis(caprolactam)( cas:138984-26-6 ) is researched.HPLC of Formula: 138984-26-6.Yang, Xin; Yang, Yongsheng; Xue, Ying published the article 《Computational Mechanism Study of Catalyst-Dependent Competitive 1,2-C→C, -O→C, and -N→C Migrations from β-Methylene-β-silyloxy-β-amido-α-diazoacetate: Insight into the Origins of Chemoselectivity》 about this compound( cas:138984-26-6 ) in ACS Catalysis. Keywords: methylenesilyloxyamidodiazoacetate migration mechanism chemoselectivity. Let’s learn more about this compound (cas:138984-26-6).

Doyle et al. recently reported an efficient catalyst-controlled chemoselectivity of competitive 1,2-C→C, -O→C, and -N→C migrations from β-methylene-β-silyloxy-β-amido-α-diazoacetates using dirhodium or copper catalysts. With the aid of d. functional theory calculations, the present study systematically probed the mechanism of the aforementioned reactions and the origins of the catalyst-controlled chemoselectivity. Similar to the method reported in the literature, simplified catalyst models Rh2(O2CH)4 and Rh2(N-methylformamide)4 have been used in our initial calculations However, using the Rh2(O2CH)4 model could not describe the energies of all possible pathways, and high selectivity of three competitive migrations could not be achieved. In order to appropriately describe this 1,2-migration system, real catalyst models Rh2(cap)4, Rh2(esp)2, and CuPF6 have been employed. It was found that the steric and electronic effects of ligands significantly influence the free energy barrier, which ultimately changes the chemoselectivity. In the CuPF6 system, the electronic effects, coupled with the steric factor, give a qual. explanation for the exclusive chemoselectivity of 1,2-N→C migration over 1,2-C→C or -O→C migration. On the other hand, the bulky ligands of dirhodium catalysts result in the significant steric hindrance around the dirhodium centers and withdrawal of the empty space around the bulky -OTBS group. By analyzing the divergence of three different migration transition states using the distortion/interaction and natural bond orbital analyses, it was found that the 1,2-N→C migration will suffer from a high free energy barrier because of the steric repulsion between the carbonyl group and the carbonyl oxygen of the pyrazolidinone ring. For 1,2-C→C and -O→C migrations, changing the ligands of dirhodium catalysts can change the electronic properties of carbenes, and that is the reason for controlling the major product by changing the dirhodium catalysts. The mechanistic proposal is supported by the calculated chemoselectivities, which are in good agreement with the exptl. results.

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Computed Properties of C24H40N4O4Rh2. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about Site selective C-H insertion of unactivated α-diazo-α-aroyl esters catalyzed by Rh(II) carboxylates.

The results from the study of C-H insertion of unactivated α-diazo-α-aroyl esters catalyzed by rhodium(II) carboxylates which give β-lactones indicate that steric effects may play a major role in product formation.

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Related Products of 138984-26-6. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about Unusual formation of 7-vinylcycloheptatriene derivatives in the catalytic cyclopropanation of cyclooctatetraene with diazocarbonyl compounds in the presence of rhodium catalysts.

The reaction of cyclooctatetraene with Me diazoacetate or diazoacetone in the presence of Rh binuclear complexes gives, besides 9-substituted bicyclo[6.1.0]nona-2,4,6-trienes (mixture of anti- and syn-isomers, total yields 60-75%), isomeric β-(cyclohepta-2,4,6-trien-l-yl)acrylates or 4-(cyclohepta-2,4,6-trien-l-yl)but-3-en-2-one in 20-34% yields. In the case of Me diazoacetate, a mixture of E- and Z-isomers in a ratio of ∼3.5: 1 was obtained, while diazoacetone gave only E-isomer.

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Recommanded Product: 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 Rh2(esp)2-catalyzed allylic and benzylic oxidations. Author is Wang, Yi; Kuang, Yi; Wang, Yuanhua.

The dirhodium(II) catalyst Rh2(esp)2 allows direct solvent-free allylic and benzylic oxidations by T-HYDRO with a remarkably low catalyst loading. This method is operationally simple and scalable at ambient temperature without the use of any additives. The high catalyst stability in these reactions may be attributed to a dirhodium(II,II) catalyst resting state, which is less prone to decomposition

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
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Computed Properties of C24H40N4O4Rh2. 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 Facile generation of aziridines from the reaction of α-diazoamides with tethered oximino-ethers. Author is McMills, Mark C.; Wright, Dennis L.; Zubkowski, Jeffrey D.; Valente, Edward J..

Preparation of the central diazabicyclo[3.2.1]octane (I) core of quinocarcin via azomethine ylide intermediates generated from metal catalyzed cycloaddition of an electron deficient olefin with oximino-ether (II) containing a tethered α-diazoamide moiety was attempted. Cyclization of II with Me acrylate in the presence of several metal catalysts, e.g. Rh2(OAc)4 and Cu(acac)2, resulted in the formation of aziridine III with, at most, only trace amounts of the desired target compound I being formed when Cu(acac)2 and Cu(hfaca)2 were used as the catalysts.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
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Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov’t, Angewandte Chemie, International Edition called Synthesis of (±)-Tetrapetalone A-Me Aglycon, Author is Carlsen, Peter N.; Mann, Tyler J.; Hoveyda, Amir H.; Frontier, Alison J., which mentions a compound: 138984-26-6, 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 C24H40N4O4Rh2, Product Details of 138984-26-6.

The first synthesis of (±)-tetrapetalone A-Me aglycon (I) is described. Key bond-forming reactions include Nazarov cyclization, a ring-closing metathesis promoted with complete diastereoselectivity by a chiral molybdenum-based complex, tandem conjugate reduction/intramol. aldol cyclization, and oxidative dearomatization.

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