Day: March 30, 2022

Recommanded Product: 13940-83-5. 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: Nickel(ii)fluoridetetrahydrate, is researched, Molecular F2H8NiO4, CAS is 13940-83-5, about Preparation of high-purity nickel compound from Ni-containing waste materials. Author is Gu, Heng; Li, Xingying; Zhu, Jianchun; Zhou, Jinyun.

The process conditions for the preparation of high-purity Ni compounds (NiSO4.6H2O, NiF2.4H2O, Ni(Ac)2.4H2O, and NiO) from Ni-containing waste carbonate by H2SO4 leaching were studied, and a technol. process was proposed. The principle for the purification and extraction of Ni solution in the system of H2SO4 was discussed with phase diagram. The recovery of Ni was 92%, and the quality of the product met the national standard

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Wassenaar, Jeroen; Siegler, Maxime A.; Spek, Anthony L.; de Bruin, Bas; Reek, Joost N. H.; van der Vlugt, Jarl Ivar published the article 《Versatile new C3-symmetric tripodal tetraphosphine ligands; structural flexibility to stabilize CuI and RhI species and tune their reactivity》. Keywords: phosphine tetraphosphine tripodal indole preparation copper rhodium iridium complex; cyclopropanation catalyst copper tetraphosphine tripodal indole linked complex; rhodium iridium tripodal tetraphosphine tetradentate indole linked complex preparation; oxidation rhodium tripodal tetraphosphine tetradentate indole linked complex; divalent monomeric rhodium tripodal tetraphosphine tetradentate indole linked complex; ESR spectra divalent monomeric rhodium tripodal tetraphosphine indole complex; magnetic susceptibility divalent monomeric rhodium tripodal tetraphosphine indole complex; redox potential divalent monomeric rhodium tripodal tetraphosphine indole complex; hydride rhodium divalent monomeric rhodium tripodal tetraphosphine indole complex; crystal structure rhodium iridium copper tripodal indolyltetraphosphine complex; mol structure rhodium iridium copper tripodal indolyltetraphosphine complex.They researched the compound: Chloro(1,5-cyclooctadiene)copper(I) dimer( cas:32717-95-6 ).Formula: C16H16Cl2Cu2. 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:32717-95-6) here.

Tripodal indolyl phosphine ligands, P(X1PR2)3 (1, 2; X = 3-methyl-1,2-indolediyl; R = Ph, iPr) and P(X2PPh2)3 (3, X2 = 3-methyl-2,1-indolediyl) were prepared by lithiation and phosphination of 3-methylindole; crystal structures, catalytic activity and reactivity of Cu(I), Rh(I) Rh(II) complexes of 1-3 were explored. The high-yielding synthesis and detailed characterization of two well-defined, linkage isomeric tripodal, tetradentate all-phosphorus ligands 1-3 is described. Coordination to Cu(I) resulted in formation of complexes [CuCl[P(X1PR2-κP)2(X1PR2)-κP]] (4, 5, R = Ph, iPr) and [CuCl[P(X2PR2-κP)2(X2PR2)-κP]] (6), for which the mol. structures indicate overall tridentate coordination to the copper atom in the solid state, with one dangling peripheral phosphine. The solution studies suggest fast exchange between the three phosphine side-arms. These new CuI complexes 4-6 catalyze cyclopropanation of styrene with ethyldiazoacetate (EDA), yielding Et 2-phenylcyclopropanecarboxylate with 70:30 trans:cis-selectivity. The anticipated well-defined tetradentate coordination in a C3-sym. fashion was achieved with RhI and IrI, leading to the overall five-coordinated complexes [MCl[P(X1PR2-κP)3-κP]] (7, 9, M = Rh, Ir), [MCl[P(X2PR2-κP)3-κP]] (8, 10, M = Rh, Ir), [Rh(L)[P(X1PR2-κP)3-κP]][BF4] (11, 12, L = η2-norbornadiene, CO). Complex 11 has the norbornadiene (nbd) ligand coordinated in an unprecedented monodentate 2,3-η2 mode to Rh. Furthermore, unexpected but very interesting redox-chem. and reactivity was displayed by the Rh(Cl)-complexes 7 and 8. Oxidation resulted in the formation of stable RhII metalloradicals [7]PF6 and [8]PF6 that were characterized by x-ray crystallog., magnetic susceptibility measurements, cyclic voltammetry, and ESR spectroscopy. Subsequent redox-reactivity of these metalloradicals toward mol. hydrogen is described, resulting in the formation of RhIII hydride compounds

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Application In Synthesis of (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine. 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: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, is researched, Molecular C38H34N2O4P2, CAS is 221012-82-4, about Pd-catalyzed asymmetric alternating co-polymerization of propene with carbon monoxide using ionic liquids. Author is Wang, Hai-Jun; Wang, Lai-Lai; Lam, Wing-Sze; Yu, Wing-Yiu; Chan, Albert S. C..

A protocol for Pd-catalyzed stereoselective co-polymerization of propene and carbon monoxide using chiral ligands, such as (2S,3S)-DIOP and (R)-P-Phos in [C4mim][PF6]/[C6mim][PF6] as an ionic liquid medium was developed. With (2S,3S)-DIOP as chiral ligand and [C4mim][PF6] as medium, the Pd-catalyzed co-polymerization of propene and CO gave almost completely regioregular polyketones, and the product polymer showed moderate stereoregularity (61% of l-diads). The highest molar optical rotation = +15.9 and polydispersity = 1.2 were attained when (R)-P-Phos was used as the ligand and [C6mim]PF6 as the solvent. The co-polymer exhibited regioregularity of H-H/H-T/T-T (%) = 17:66:17.

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Quinoxaline – Wikipedia,
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Category: quinoxaline. 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: Chloro(1,5-cyclooctadiene)copper(I) dimer, is researched, Molecular C16H16Cl2Cu2, CAS is 32717-95-6, about Organometallic chemistry. VI. Meerwein reaction. IV. Mechanistic aspects. Author is Al Adel, I.; Adeoti Salami, B.; Levisalles, J.; Rudler, H..

The key step in the Meerwein reaction of p-ClC6H4N2+ salts in the presence of unsaturated compounds is formation of aryl radicals; complexation of the Cu(I) salt with the unsaturated compound plays only a minor role. Thus, treatment of RCuCl or R2CuBF4 (R = cyclooctadiene) with p-ClC6H4N2+X- (X = Cl, BF4) gives no Meerwein products. Similarly, treatment of CH2:CHCH2OH, which complexes easily with Cu, with p-ClC6H4N2+ and a Cu(I) catalyst gives only 5% of the Meerwein product p-ClC6H4CH2CHClCH2OH. On the other hand, the Meerwein reaction of CH2:CH(CH2)2CH2OH with p-ClC6H4N2+ gives the Meerwein product p-ClC6H4CH2CHCl(CH2)2CH2OH, I [via an aryl intermediate oxidized to a carbocation by Cu(I)], as well as p-ClC6H4N:NCH(CH2C6H4Cl-p)(CH2)2CH2OH and II.

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Buendia, Julien; Darses, Benjamin; Dauban, Philippe published an article about the compound: 1-(Bromomethyl)-4-ethylbenzene( cas:57825-30-6,SMILESS:CCC1=CC=C(CBr)C=C1 ).Reference of 1-(Bromomethyl)-4-ethylbenzene. 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:57825-30-6) through the article.

A new tandem C-N and C-C bond-forming reaction has been achieved through RhII/Pd0 catalysis. The sequence combines a catalytic C(sp3)-H nitrene insertion with a palladium-catalyzed C-C cross-coupling to afford complex nitrogenous mols., e.g., I, with very good yields and complete stereoselectivity. The sequence first involves an iodine(III) oxidant, then the in situ generated iodine(I) byproduct is used as a coupling partner. The synthetic value of iodoarenes produced in trivalent iodine reagent mediated oxidations has been demonstrated.

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Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Chloro(1,5-cyclooctadiene)copper(I) dimer, is researched, Molecular C16H16Cl2Cu2, CAS is 32717-95-6, about Rare, Hexatomic, Boat-Shaped, Cross-Linked Bis(iminodiphenylphosphorano)methanediide Pincer Carbon Bridged Photoluminescent Copper Clusters Capped with Methyl or Halide Bridges.SDS of cas: 32717-95-6.

The dimeric dilithium methanediide salt [Li2C(Ph2P:NSiMe3)2]2 ([Li2L]2, L = [C(Ph2P:NSiMe3)2]2-) reacted with 6 equiv of [NEt4CuCl2] and 2 equiv of LiMe in THF or ether to give exclusively the six-Cu cluster complex [Cu6L2Me2] (1). Similarly, [Li2L]2 reacted with 3 equiv of the bimetallic Cu halide complexes [(cod)2Cu2X2] (X = Cl, Br, I) in the same solvent to give good yields of three halide-capped six-Cu clusters [Cu6L2(X)2] [X = Cl (2), Br (3), I (4)] with structures very similar to that of 1. These four hexacopper clusters (1-4) as a family show similar 31P NMR spectra with an AB pattern with slightly different chem. shifts but identical coupling constants in solution The reactivity of 2 was explored, and 1 can be quant. generated by addition of 2 equiv of LiMe to 2. Also, the cluster [Cu6L2(OtBu)2] (5) with a similar cage structure is quant. generated by reaction of 2 with 2 equiv of NaOtBu in solution according to 31P NMR spectroscopy. An addnl. Cu complex with a bicopper formulation, [Cu2L(PPh3)2] (6), was synthesized by reaction of [Li2L]2 with 2 equiv of [(NEt4)Cu(PPh3)Cl2]. The authors also observed a monocopper iodide complex with the doubly protonated parent methylene bridged ligand H2L, [CuI(H2L)] (7), as a minor component (∼10%) during the preparation of complex 4. Complexes 1-4, 6, and 7 were characterized by x-ray crystal diffraction. All four clusters (1-4) show a rare boat-shaped conformation of hexacopper clusters assembled by crosslinking of two Cu atoms via geminal substitution on one bis(iminophosphorano)methanediide ligand. Two of these units combine along with two addnl. Cu atoms to form the boat cluster. There is extensive direct Cu-Cu bonding. The cluster is doubly capped, top and bottom, by Me groups (1) or halides (2-4, X = Cl, Br, I). All of these six-Cu clusters absorb and emit in the UV-visible region. The absorption bands and photoluminescent wavelengths are substituent dependent; thus, optical properties of the complex are tunable by substitution of the capping ligands. The spectral and bonding characteristics were explored by Gaussian DFT calculations and NBO anal.

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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: 13940-83-5, is researched, Molecular F2H8NiO4, about Influence of HF2- geometry on magnetic interactions elucidated from polymorphs of the metal-organic framework [Ni(HF2)(pyz)2]PF6 (pyz = pyrazine), the main research direction is nickel pyrazine bifluoride coordination polymer preparation heat capacity; magnetic exchange entropy nickel pyrazine bifluoride coordination polymer; optimized mol structure nickel pyrazine bifluoride coordination polymer; crystal structure nickel pyrazine bifluoride metal organic framework.Name: Nickel(ii)fluoridetetrahydrate.

A tetragonal polymorph of [Ni(HF2)(pyz)2]PF6 (designated β) is isomorphic to its SbF6-congener at 295 K and features linear Ni-FHF-Ni pillars. Enhancements in the spin exchange (JFHF = 7.7 K), Neel temperature (TN = 7 K), and critical field (Bc = 24 T) were found relative to monoclinic α-PF6. DFT reveals that the HF2- bridges are significantly better mediators of magnetic exchange than pyz (Jpyz), where JFHF ≈ 3Jpyz, thus leading to quasi-1D behavior. Spin d. resides on all atoms of the HF2- bridge whereas N-donor atoms of the pyz ring bear most of the d.

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Name: Nickel(ii)fluoridetetrahydrate. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Nickel(ii)fluoridetetrahydrate, is researched, Molecular F2H8NiO4, CAS is 13940-83-5, about MF2 vibrations and librations of water molecules in the series MF2 · 4H2O (M = iron, cobalt, nickel or zinc). Author is Swanepoel, J.; Heyns, A. M..

The IR absorption spectra of the series MF2·4H2O (M = Fe, Co, Ni, or Zn) and of the resp. deuterates were recorded at 296 K and ∼100 K in the 1200-1400 cm-1 wavenumber region. Using the known ZnF2·4H2O structure as a model, the number of IR active librations and MF2 vibrations was predicted with the aid of a group theor. treatment. The librations were distinguished from the MF2 and M-O vibrations and assigned, using isotopic ratios and correlations between the unit cell volumes, the uncoupled O-H and O-D stretch vibrations of HDO, and the twisting libration. The six librations are assigned to types of water mols. with low symmetry and with different hydrogen bond strengths, and are compatible with an orthorhombic Pca21 structure. The ν1 and ν3 intramol. MF2 vibrations are assigned, using ZnF2·4H2O crystal data and matrix-isolated ν1 and ν3 (ν1,3) values as guide. Shifts of ν1,3 and ν1/ν3 relative to the matrix-isolated values suggest smaller M-F bond lengths. The shifts in the values of ν1,3 and ν1/ν3 upon deuteration and lowering of the temperature indicate smaller M-F bond lengths and F-M-F angles.

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Chen, Zhi; Chen, Zhi-Chao; Du, Wei; Chen, Ying-Chun published the article 《Asymmetric [4 + 3] Annulations for Constructing Divergent Oxepane Frameworks via Cooperative Tertiary Amine/Transition Metal Catalysis》. Keywords: oxepane framework preparation enantioselective diastereoselective; indole vinyl carbonate amine metal catalyst annulation.They researched the compound: Chloro(1,5-cyclooctadiene)copper(I) dimer( cas:32717-95-6 ).Formula: C16H16Cl2Cu2. 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:32717-95-6) here.

Asym. [4+3] annulations between isatin-derived Morita-Baylis-Hillman carbonates and two types of vinyl carbonates synergistically catalyzed by tertiary amines and transition metals, through chemoselective assemblies of in situ formed allylic ylides and metal-containing 1,4-dipoles were reported. A range of oxepane frameworks I [R1 = H, 5-Me, 5-Br, etc.; R2 = Me, Et; R3 = Me, allyl, Bn, etc.] and II [X = CF, CCH3, NH, etc.] were generally constructed in moderate to good yields with high stereocontrol. Moreover, all four diastereomers for the products bearing vicinal stereocenters were accessible by tuning tertiary amine and metal catalysts.

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Reference of (S)-Propane-1,2-diamine dihydrochloride. 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: (S)-Propane-1,2-diamine dihydrochloride, is researched, Molecular C3H12Cl2N2, CAS is 19777-66-3, about Optically active complexes of Schiff bases. I. Syntheses and properties of optically active tetradentate Schiff bases. Author is Gullotti, Michele; Pasini, Alessandro; Fantucci, Piercarlo; Ugo, Renato; Gillard, Robert D..

Reproducible syntheses and resolutions of 1,2-diamines were reported. Isomeric Schiff bases were prepared by condensation of 1 mole of (+),(-), or meso-1,2-diamine with 2 moles MeCOCH2COMe, salicylaldehyde or (+)-hydroxymethylenecamphor and identified by NMR and ir spectra. Configurational studies of the Schiff bases were made on the basis of ORD and CD spectra.

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Quinoxaline – Wikipedia,
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