Category: ruthenium-catalysts

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis of heterocyclic compounds of nitrogen. XXXIV. Derivatives of 2-chloro- and 2-aminobenzothiazole-6-sulfonamide》. Authors are Takahashi, Torizo; Taniyama, Hyozo.The article about the compound:2-Chloro-6-nitrobenzo[d]thiazolecas:2407-11-6,SMILESS:O=[N+](C1=CC=C2N=C(Cl)SC2=C1)[O-]).HPLC of Formula: 2407-11-6. Through the article, more information about this compound (cas:2407-11-6) is conveyed.

2-Mercaptobenzothiazole with PCl5 and POCl3 on a boiling water bath gave 2-chlorobenzothiazole (I), whereas heating at 130-40° gave benzothiazole, pale yellow oil, b. 234°. Nitration of I gave 2-chloro-6-nitrobenzothiazole (II), pale yellow needles, m. 190°, which was reduced to the 2-chloro-6-amino compound (III), colorless needles, m. 163°, and converted to the 2-chloro-6-acetamido compound, colorless needles, m. 97°. Condensation of III and p-AcNHC6H4SO2Cl gave 2-chloro-6-(p-acetamidophenylsulfonamido)benzothiazole, colorless plates, m. 254°, hydrolyzed to the p-aminophenyl compound, colorless needles, m. 97°. II and 2-mercapto-6-nitrobenzothiazole gave bis(6-nitro-2-benzothiazolyl) sulfide, light yellow needles, m. 280-1°, which was reduced to the diamino compound, colorless needles, m. 272-3°. Cu(SCN)2 with p-H2NC6H4SO2NH2 gave 2-amino-6-benzothiazolesulfonamide, colorless needles, decompose 273°, which gave the 2-acetamido compound, colorless plates, m. 302°, and the 2-benzamido compound, colorless prisms, m. 248-9°, by heating with Ac2O and BzCl, resp..

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

Formula: C24H40N4O4Rh2. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about Highly selective enantiomer differentiation in intramolecular cyclopropanation reactions of racemic secondary allylic diazoacetates.. Author is Doyle, Michael P.; Dyatkin, Alexey B.; Kalinin, Alexey V.; Ruppar, Daniel A.; Martin, Stephen F.; Spaller, Mark R.; Liras, Spiros.

Highly efficient enantiomer differentiation of racemic secondary allylic diazoacetates in intramol. cyclopropanation reactions has been achieved using chiral dirhodium(II) carboxamidates. Dirhodium(II) tetrakis[methyl 2-oxazolidinone-4(S or R)-carboxylate], Rh2(4S-MEOX)4 or Rh2(4R-MEOX)4, provides the highest levels of enantiomer selectivity in cyclizations of racemic 2-cycloalken-1-yl diazoacetates affording enantiomeric excesses of 94-95% (C5 and C6) or 83% (C7). In reactions catalyzed by Rh2(4S-MEOX)4, (1S)-cycloalk-2-en-1-yl diazoacetates undergo cyclopropanation, whereas (1R)-cycloalk-2-en-1-yl diazoacetates form 2-cycloalkenones and 1-methylene-2-cycloalkenes. The mirror image isomers are formed from reactions catalyzed by Rh2(4R-MEOX)4. Thus, refluxing 2-cyclohexen-1-yl diazoacetate (I) with Rh2(4S-MEOX)4 in CH2Cl2 gave a 40% yield of bicyclic lactone (II) in 94% enantiomeric excess.

In some applications, this compound(138984-26-6)Formula: C24H40N4O4Rh2 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

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

Computed Properties of C8H12BCuF4N4. 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: Copper(I) tetra(acetonitrile) tetrafluoroborate, is researched, Molecular C8H12BCuF4N4, CAS is 15418-29-8, about Target design and synthesis of three naphthyl-functionalized Copper(II) coordination compounds for their photothermal properties.

In order to achieve a light-harvesting system with excellent photo-thermal conversion property, three naphthyl(NT)-functionalized copper(II) coordination compounds were designed and isolated. They were characterized by IR, Powder XRD, UV, and TGA. Single-crystal X-ray structural anal. reveals that {[Cu4(bpy)4(1-NTAA)5](BF4)3•3(CH3OH)•H2O}∞ (1) has 1D chain structure, {[Cu2(1-NTAA)4(MeCN)2]•2(MeCN)} (2) and {[Cu2(2-NTA)4(MeCN)2]•2.5(MeCN)} (3) have similar paddle-wheel structures. Using the introduction of NT-groups into copper(II) centers, all three compounds exhibit good solid-state optical absorption in a nearly full solar spectral region. The coordination polymer 1 exhibits the quickest temperature rising (nearly 2°/min from the very beginning), the highest temperature increment (12°) and equilibrium temperature (40°) over the other two compounds in the photothermal conversion experiments Those results point out the direction of mol. design for enhancing photothermal conversion performance.

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

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.Computed Properties of C8H12BCuF4N4. The article 《Cycloaddition Chemistry of 2-Vinyl-Substituted Indoles and Related Heteroaromatic Systems》 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 intramol. Diels-Alder cycloaddition reaction (IMDAF) of several N-phenylsulfonylindolyl-substituted furanyl carbamates containing a tethered π-bond on the indole ring were examined as an approach to the iboga alkaloid catharanthine. Only in the case where the tethered π-bond contained two carbomethoxy groups did the [4+2]-cycloaddition occur. Push-pull dipoles generated from the Rh(II)-catalyzed reaction of diazo imides, on the other hand, undergo successful intramol. 1,3-dipolar cycloaddition across both alkenyl and heteroaromatic π-bonds to provide novel pentacyclic compounds (e.g. I) in good yield and in a stereocontrolled fashion. The facility of the cycloaddition was found to be critically dependent on conformational factors in the transition state. Ligand substitution in the rhodium(II) catalyst markedly altered the product ratio between [3+2]-cycloaddition and intramol. C-H insertion. The variation in reactivity reflects the difference in electrophilicity between the various rhodium carbenoid intermediates. Intramol. C-H insertion is enhanced with the more electrophilic carbene generated using Rh(II) perfluorobutyrate.

In some applications, this compound(138984-26-6)COA of Formula: C24H40N4O4Rh2 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

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

Name: 2-Bromopropanenitrile. 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: 2-Bromopropanenitrile, is researched, Molecular C3H4BrN, CAS is 19481-82-4, about Temperature Effect on Activation Rate Constants in ATRP: New Mechanistic Insights into the Activation Process. Author is Seeliger, Florian; Matyjaszewski, Krzysztof.

Activation rate constants (kact) for a variety of initiators for Cu-mediated ATRP were measured with Cu(I)Br(PMDETA) at various temperatures (i.e., -40 to +60 °C). Reactions of less active alkyl halides were more accelerated by increased temperatures than reactions of more active initiators. Straight Eyring and Arrhenius plots were obtained, from which the activation parameters (i.e., ΔH⧧, ΔS⧧, Ea, and ln A) were determined The activation enthalpies ΔH⧧ are in between 26.0 and 38.7 kJ mol-1 with highly neg. activation entropies (ΔS⧧ = -156 to -131 J mol-1 K-1), which indicate greatly ordered structures of the transition states for these reactions.

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

Prein, Michael; Padwa, Albert 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 ).Safety of Dirhodium(II) tetrakis(caprolactam). 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.

The product distribution obtained from the Rh(II)-catalyzed decomposition of α-diazoimide MeO2CCH2NAcCOC(:N2)CO2Me can be selectively controlled by the proper choice of catalyst. While perfluorinated ligands favor isomuenchnone formation, products derived from six-membered ring cyclization are preferred using Rh2(OAc)4. The effect can be modulated by the addition Sc(OTf)3 as a Lewis acid.

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

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 2-Chloro-6-nitrobenzo[d]thiazole(SMILESS: O=[N+](C1=CC=C2N=C(Cl)SC2=C1)[O-],cas:2407-11-6) is researched.Application In Synthesis of Dirhodium(II) tetrakis(caprolactam). The article 《Stereodivergent, Diels-Alder-initiated organocascades employing α,β-unsaturated acylammonium salts: scope, mechanism, and application》 in relation to this compound, is published in Chemical Science. Let’s take a look at the latest research on this compound (cas:2407-11-6).

Chiral α,β-unsaturated acylammonium salts are novel dienophiles enabling enantioselective Diels-Alder-lactonization (DAL) organocascades leading to cis- and trans-fused, bicyclic γ- and δ-lactones from readily prepared dienes, commodity acid chlorides, and a chiral isothiourea organocatalyst under mild conditions. The authors describe extensions of stereodivergent DAL organocascades to other racemic dienes bearing pendant secondary and tertiary alcs., and application to a formal synthesis of (+)-dihydrocompactin is described. A combined exptl. and computational study of unsaturated acylammonium salt formation and the entire DAL organocascade pathway provide a rationalization of the effect of Bronsted base additives and enabled a controllable, diastereodivergent DAL process leading to a full complement of possible stereoisomeric products. Evaluation of free energy and enthalpy barriers in conjunction with exptl. observed temperature effects revealed that the DAL is a rare case of an entropy-controlled diastereoselective process. NMR anal. of diene alc.-Bronsted base interactions and computational studies provide a plausible explanation of observed stabilization of exo transition-state structures through H-bonding effects.

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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 《Benzothiazoles. XI. Cyclohexylamine substitution of 2-halo-6-nitrobenzothiazoles》. Authors are Foa, M.; Ricci, A.; Todesco, P. E.; Vivarelli, P..The article about the compound:2-Chloro-6-nitrobenzo[d]thiazolecas:2407-11-6,SMILESS:O=[N+](C1=CC=C2N=C(Cl)SC2=C1)[O-]).Safety of 2-Chloro-6-nitrobenzo[d]thiazole. Through the article, more information about this compound (cas:2407-11-6) is conveyed.

cf. CA 63, 1676a, 8171a. The reaction of cyclohexylamine (I) and 2-Cl or 2-Br-6NO2-benzothiazole to give 2-cyclohexylamino-6-nitrobenzothiazole (II), m. 167° (alc.), was studied in MeOH, EtOH, and isoPrOH. In MeOH in addition to II, 30% of the 2-MeO derivative was formed. Addition of I.HClO4 inhibits methanolysis and also decreases the rate of aminolysis. I.HClO4 also diminished the rate in EtOH when solvolysis was absent. LiClO4 and Et4N+ClO4- on the other hand increased the rate of the aminolysis reaction. Et2NH.HClO4 also decreases the rate of reaction of Et2NH and 2-halobenzothiazoles. KCl/KBr is about 1.4 in the reactions studied.

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

Recommanded Product: Tris(2,2′-bipyridine)ruthenium bis(hexafluorophosphate). The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Tris(2,2′-bipyridine)ruthenium bis(hexafluorophosphate), is researched, Molecular C30H24F12N6P2Ru, CAS is 60804-74-2, about Photocatalytic Fluoro Sulfoximidations of Styrenes. Author is Wang, Chenyang; Tu, Yongliang; Ma, Ding; Bolm, Carsten.

Reactions of difluoroiodotoluene with NH-sulfoximines provide new hypervalent iodine(III) reagents, which photocatalytically transfer a fluoro and a sulfoximidoyl group onto styrenes with high regioselectivity [e.g., stepwise I + II followed by treatment with styrene and photocatalyst under blue LED → III (83%, diastereomer mix)]. The substrate scope is broad with respect to both sulfoximines and olefins. Following an operationally simple protocol, a large library of fluorine-containing N-functionalized sulfoximines can be accessed. Results from mechanistic investigations revealed the importance of radical intermediates.

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

Synthetic Route of C24H40N4O4Rh2. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Dirhodium(II) tetrakis(caprolactam), is researched, Molecular C24H40N4O4Rh2, CAS is 138984-26-6, about Dirhodium-catalyzed phenol and aniline oxidations with T-HYDRO. Substrate scope and mechanism of oxidation. Author is Ratnikov, Maxim O.; Farkas, Linda E.; McLaughlin, Emily C.; Chiou, Grace; Choi, Hojae; El-Khalafy, Sahar H.; Doyle, Michael P..

Dirhodium caprolactamate, Rh2(cap)4, is a very efficient catalyst for the generation of the tert-butylperoxy radical from tert-Bu hydroperoxide, and the tert-butylperoxy radical is a highly effective oxidant for phenols and anilines. These reactions are performed with 70% aqueous tert-Bu hydroperoxide using dirhodium caprolactamate in amounts ≥0.01 mol % to oxidize para-substituted phenols to 4-(tert-butyldioxy)cyclohexadienones. Although these transformations have normally been performed in halocarbon solvents, there is a significant rate enhancement when Rh2(cap)4-catalyzed phenol oxidations are performed in toluene or chlorobenzene. Electron-rich and electron-poor phenolic substrates undergo selective oxidation in good to excellent yields, but steric influences from bulky para substituents force oxidation onto the ortho position resulting in ortho-quinones. Comparative results with RuCl2(PPh3)3 and CuI are provided, and mechanistic comparisons are made between these catalysts that are based on diastereoselectivity (reactions with estrone), regioselectivity (reactions with p-tert-butylphenol), and chemoselectivity in the formation of 4-(tert-butyldioxy)cyclohexadienones. The data obtained are consistent with hydrogen atom abstraction by the tert-butylperoxy radical followed by radical combination between the phenoxy radical and the tert-butylperoxy radical. Under similar reaction conditions, para-substituted anilines are oxidized to nitroarenes in good yield, presumably through the corresponding nitrosoarene, and primary amines are oxidized to carbonyl compounds by TBHP in the presence of catalytic amounts of Rh2(cap)4.

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