Tag: M.W=400-500

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: 14481-08-4, is researched, SMILESS is CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C, Molecular C22H38NiO4Journal, Article, Faraday Discussions called Application of stopped flow techniques and energy dispersive EXAFS for investigation of the reactions of transition metal complexes in solution: Activation of nickel β-diketonates to form homogeneous catalysts, electron transfer reactions involving iron(iii) and oxidative addition to iridium(i), Author is Abdul Rahman, M. Basyaruddin B.; Bolton, Peter R.; Evans, John; Dent, Andrew J.; Harvey, Ian; Diaz-Moreno, Sofia, the main research direction is stopped flow technique EXAFS nickel diketonate homogeneous hexene catalysis; electron transfer reaction aqueous iron cation hydroquinone EXAFS; oxidative addition methyl fluoro methylsulfonate carbonyl iodo iridate EXAFS.Name: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II).

Stopped-flow techniques of rapid mixing have been combined with energy dispersive X-ray absorption spectroscopy to monitor the reaction of Ni(dpm)2 {dpm = ButC(O)CHC(O)But} by aluminum alkyls (AlEt2X, X = OEt and Et) to form the active species for the catalytic di- and tri-merisation of hex-1-ene. Acquisition times down to ca. 30 ms were achieved on Station 9.3 of the SRS using a photodiode array detector. The EXAFS features of the resulting solution complexes are of the form [Ni(O-O)(R)(alkene)]. In the presence of PPh3, [Ni(O-O)(R)(PPh3)] appears to be the predominant type of species. The reduction of aqueous Fe(iii) by hydroquinone was investigated on ID24 at the ESRF by Fe K-edge energy dispersive EXAFS with a CCD camera as detector; spectra were obtained in 1 ms or longer. No intermediate inner sphere complex was detected prior to the formation of aqueous Fe(ii). Finally the oxidative addition of CH3SO3CF3 to [IrI2(CO)2]- was monitored on Station 9.3 with a silicon microstrip detector. A single acquisition of 400 μs was feasible, with spectra recorded in multiples of 1.2 ms. In that time, the first stage of the reaction had been completed, with a slower stage thereafter. The results are consistent with the two-stage ionic oxidative addition mechanism.

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Ester – an overview | ScienceDirect Topics

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.Rosales, Anthony R.; Wahlers, Jessica; Lime, Elaine; Meadows, Rebecca E.; Leslie, Kevin W.; Savin, Rhona; Bell, Fiona; Hansen, Eric; Helquist, Paul; Munday, Rachel H.; Wiest, Olaf; Norrby, Per-Ola researched the compound: (((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine)( cas:32305-98-9 ).Application of 32305-98-9.They published the article 《Rapid virtual screening of enantioselective catalysts using CatVS》 about this compound( cas:32305-98-9 ) in Nature Catalysis. Keywords: rapid virtual screening enantioselective catalyst CatVS. We’ll tell you more about this compound (cas:32305-98-9).

The development of computational tools to support organic synthesis, including the prediction of reaction pathways, optimization and selectivity, is a topic of intense current interest. Transition state force fields, derived by the quantum-guided mol. mechanics method, rapidly calculate the stereoselectivity of organic reactions accurately enough to allow predictive virtual screening. Here we describe CatVS, an automated tool for the virtual screening of substrate and ligand libraries for asym. catalysis within hours. It is shown for the OsO4-catalyzed cis-dihydroxylation that the results from the automated set-up are indistinguishable from a manual substrate screen. Predictive computational ligand selection is demonstrated in the virtual ligand screen of a library of diphosphine ligands for the rhodium-catalyzed asym. hydrogenation of enamides. Subsequent exptl. testing verified that the most selective substrate-ligand combinations are successfully identified by the virtual screen. CatVS is therefore a promising tool to increase the efficiency of high-throughput experimentation.

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Ester – Wikipedia,
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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The crystal structure of SbCl5.HCON(CH3)2》. Authors are Brun, Lars; Branden, Carl Ivar.The article about the compound:Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C).Product Details of 14481-08-4. Through the article, more information about this compound (cas:14481-08-4) is conveyed.

The crystal structure of SbCl5.HCON-(CH3)2 has been determined from 3-dimensional x-ray data. The crystals are monoclinic, space group P21/n, with Z = 4. Cell dimensions are, a 9.706, b 13.520, c 8.760 A., β 91° 51′. The at. parameters were refined by the method of least sqs. The structure is built up from discrete SbCl5.HCON(CH3)2 mols. The Sb atom is octahedrally coordinated by 5 Cl atoms and the carbonyl O atom of N,N-dimethylformamide. Changes in the configurations and dimensions from that of the free acceptor and donor mols. are briefly discussed.

Although many compounds look similar to this compound(14481-08-4)Product Details of 14481-08-4, numerous studies have shown that this compound(SMILES:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Name: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Mixed-Ligand Approach to Changing the Metal Ratio in Bismuth-Transition Metal Heterometallic Precursors. Author is Lieberman, Craig M.; Wei, Zheng; Filatov, Alexander S.; Dikarev, Evgeny V..

A new series of heteroleptic bismuth-transition metal β-diketonates [BiM(hfac)3(thd)2] (M = Mn (1), Co (2), and Ni (3); Hhfac = hexafluoroacetylacetonate, Hthd = tetramethylheptanedionate) with Bi:M = 1:1 ratio have been synthesized by stoichiometric reactions between homometallic reagents [BiIII(hfac)3] and [MII(thd)2]. On the basis of anal. of the metal-ligand interactions in heterometallic structures, the title compounds were formulated as ion-pair {[BiIII(thd)2]+[MII(hfac)3]-} complexes. The direct reaction between homometallic reagents proceeds with a full ligand exchange between main group and transition metal centers, yielding dinuclear heterometallic mols. In heteroleptic mols. 1-3, the Lewis acidic, coordinatively unsaturated BiIII centers are chelated by two bulky, electron-donating thd ligands and maintain bridging interactions with three oxygen atoms of small, electron-withdrawing hfac groups that chelate the neighboring divalent transition metals. Application of the mixed-ligand approach allows one to change the connectivity pattern within the heterometallic assembly and to isolate highly volatile precursors with the proper Bi:M = 1:1 ratio. The mixed-ligand approach employed in this work opens broad opportunities for the synthesis of heterometallic (main group-transition metal) mol. precursors with specific M:M’ ratio in the case when homoleptic counterparts either do not exist or afford products with an incorrect metal:metal ratio for the target materials. Heteroleptic complexes obtained in this study represent prospective single-source precursors for the low-temperature preparation of multiferroic perovskite-type oxides.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4 ) is researched.SDS of cas: 14481-08-4.Rahman, M. B. Abdul; Evans, J.; Dent, A. J. published the article 《Time-resolved energy dispersive extended X-ray absorption of fine structure (EXAFS) measurement of oligomerisation reaction catalysed by nickel homogeneous catalyst and alkyl-aluminium co-catalyst》 about this compound( cas:14481-08-4 ) in Materials Science Research India. Keywords: nickel diketonate alane catalysis oligomerization hexene energy dispersive EXAFS; ab initio phase shift energy dispersive EXAFS hexene oligomerization. Let’s learn more about this compound (cas:14481-08-4).

Energy Dispersive EXAFS (EDE) data was analyzed for bis(dipivaloylmethanato)nickel:AlEt2(OEt):1-hexene, using curved wave theory with ab initio phase shifts. The derived parameters for the proposed intermediate [(tert-BuC(O)CHC(O)tert-Bu)NiEt(η2-1-hexene)] were in good agreement, within exptl. error = 0.02-0.05 Å for the bond distances. A stopped flow system was used for in situ time-resolved EDE studies on the Ni systems at room temperature The growth of a pre-edge feature and change at the top of the edge can be clearly seen to show the reaction reached completion in <6 s indicates averaged distances of 3 Ni-O/C 2.00 Å. Compounds in my other articles are similar to this one(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))SDS of cas: 14481-08-4, you can compare them to see their pros and cons in some ways,such as convenient, effective and so on.

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthetic Route of C22H38NiO4. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Mechanically activated solid-Phase synthesis of nickel(II) β-diketonates. Author is Petrova, L. A.; Dudin, A. V.; Makhaev, V. D.; Zaitseva, I. G..

NiL2 (HL = acetylacetone, trifluoroacetylacetone, hexafluoroacetylacetone, dipivaloylmethane, 4-imino-2-pentanone) were prepared in 65-80 % yield by the mech. activated solid phase reaction of NiCl2 with NaL.

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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 CVD of thin oxygen permeable membrane films, published in 2003, which mentions a compound: 14481-08-4, mainly applied to oxide membrane CVD oxygen permeation, COA of Formula: C22H38NiO4.

Membranes with high mixed oxygen-ionic and electronic conductivity are of great interest for oxygen separation and catalytic membrane reactors for partial oxidation of hydrocarbons. In the diffusion regime oxygen flow through membrane is proportional to its reciprocal thickness and gas tight thin films are most promising for applications. In a single source (aerosol- and flash evaporation) CVD equipment using the mixtures of THD compounds as precursors a number of mixed-conductor layers, (La,Sr)(Ga,Fe)O3, (La,Sr)(Co,Fe)O3, La2NiO4 were deposited with a thickness 3-30 μm and typical deposition rate 10 μm/h. As substrates, various porous flat and tubular materials with a pore size up to 10 μm were tested. The film composition, microstructure and gas tightness were studied. Using post-annealing with oxide fluxes the membranes of the gas tightness high enough for applications were obtained.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Chelate Effect in the Gas Phase. The Complexes of Ni(2,2,6,6-tetramethyl-3,5-heptanedionate)2 with Bidentate Ligands》. Authors are Emmenegger, Franzpeter; Schlaepfer, Carl Wilhelm; Stoeckli-Evans, Helen; Piccand, Michel; Piekarski, Henryk.The article about the compound:Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C).Safety of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). Through the article, more information about this compound (cas:14481-08-4) is conveyed.

When a bidentate ligand L-L is added to the square planar Ni(tmhd)2 (tmhd = tetramethylheptanedionate), octahedral Ni(tmhd)2L-L (L-L = tetramethylethylenediamine (TEME), 2,2-bipyridine, dimethylaminomethoxyethane (MAO)) are formed. This reaction was studied by visible spectroscopy in toluene at 25° and in the gas phase between 150 and 350°. It allows the comparison on one hand of the chelate effect of three ligands forming five-membered chelate rings: (i) the flexible N-N ligand TEME; (ii) the rigid N-N ligand bpy; (iii) the flexible N-O ligand MAO. However, it allows the comparison of these ligands with the six-membered chelate ring-forming N-N ligand 1,3-tetramethylpropylenediamine (TEMP). From the temperature dependence of the gas-phase stability constants, enthalpies and entropies of the complex-forming reactions were derived. As there are no solvation effects in the gas phase, the reaction enthalpies are the metal-ligand bond enthalpies. This is of particular interest for the hemilabile ligand MAO. For the N-N ligands, the stability of the metal-ligand bonds decreases in the order TEME > bpy > TEMP. The entropy of the complex formation with the two flexible ligands TEME and MAO is the same, while it is slightly more pos. for the rigid bpy and a lot more pos. for TEMP. ΔformG°298 of the complexes is more neg. in the gas phase than in solution because the solvation energy of the reactants is more neg. than the solvation energy of the products. This is shown in detail for the formation of Ni(tmhd)2bpy where data of a complete thermodn. cycle are presented.

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Ester – Wikipedia,
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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The crystal structure of copper(II) succinate dihydrate》. Authors are O’Connor, B. H.; Maslen, E. N..The article about the compound:Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C).Name: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). Through the article, more information about this compound (cas:14481-08-4) is conveyed.

The crystal structure of the title compound has been established by vector methods with 3-dimensional single crystal x-ray data. The at. parameters were refined by the diagonal least sqs. approximation, the final R index being 0.095. The crystal structure has P1̅ space-group symmetry and the coordinates are defined most suitable relative to a cell of dimensions a 6.437 ± 0.011, b 7.623 ± 0.004, c 8.081 ± 0.005 A., α 103° 54′ ± 8′, β 73° 30′ ± 21′, γ 98° 37′ ± 13′. The structure consists of infinite chains of covalently bonded binuclear units each of which closely resembles the Cu(OAc)2.H2O configuration. The Cu-Cu distance of 2.610(1) A. confirms that there is magnetic exchange between the two copper atoms in each binuclear unit.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)(SMILESS: CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C,cas:14481-08-4) is researched.Name: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). The article 《Atomic/molecular layer deposition of Ni-terephthalate thin films》 in relation to this compound, is published in Dalton Transactions. Let’s take a look at the latest research on this compound (cas:14481-08-4).

Atomic/mol. layer deposition (ALD/MLD) is currently strongly emerging as an intriguing route for novel metal-organic thin-film materials. This approach already covers a variety of metal and organic components, and potential applications related to e.g. sustainable energy technologies. Among the 3d metal components, nickel has remained unexplored so far. Here the authors report a robust and efficient ALD/MLD process for the growth of high-quality nickel terephthalate thin films. The films are deposited from Ni(thd)2 (thd: 2,2,6,6-tetramethyl-3,5-heptanedionate) and terephthalic acid (1,4-benzenedicarboxylic acid) precursors in the temperature range of 180-280°C, with appreciably high growth rates up to 2.3 Å per cycle at 200°C. The films are amorphous but the local structure and chem. state of the films are addressed based on XRR, FTIR and RIXS techniques.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics