Day: April 19, 2022

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: 32717-95-6, is researched, SMILESS is C12=C(CCC3=C4CC2)[Cu+]1534[Cl-][Cu+]678(C9=C6CCC7=C8CC9)[Cl-]5, Molecular C16H16Cl2Cu2Journal, Journal of Organometallic Chemistry called Chemistry of copper(I) β-diketonate complexes. VI. Synthesis, characterization and chemical vapor deposition of 2,2-dimethyl-6,6,7,7,8,8,8-heptafluoro-3,5-octanedione (fod) copper(I) (fod)CuL complexes and the solid state structure of (fod)Cu(PMe3), Author is Chi, K. M.; Corbitt, T. S.; Hampden-Smith, M. J.; Kodas, T. T.; Duesler, E. N., the main research direction is copper CVD; octanedione dimethylheptafluoro copper Lewis base complex; Lewis base dimethylheptafluorooctanedione copper complex; crystallog Lewis base dimethylheptafluorooctanedione copper complex.Recommanded Product: Chloro(1,5-cyclooctadiene)copper(I) dimer.

A series of copper(I) compounds of the general formula (fod)CuL, where fod = 2,2-dimethyl-6,6,7,7,8,8,8-heptafluoro-3,5-octanedione, and L = PMe3, PEt3, 1,5-cyclooctadiene (1,5-COD), vinyltrimethylsilane (VTMS), 2-butyne, bis(trimethylsilyl)acetylene (BTMSA), have been prepared by the reaction of Na[fod] with CuCl in the presence of the appropriate amount of the Lewis base, L. All the compounds were characterized by elemental anal., 1H, 13C, 19F, 31P and IR spectroscopies. The spectroscopic data are consistent with the chelation of the β-diketonate ligand through its oxygen atoms to the copper(I) center. The anal. data are consistent with the empirical formula (fod)CuL. One compound, (fod)CuPMe3, was characterized in the solid-state by single-crystal x-ray diffraction which confirmed the empirical formula and revealed the monomeric nature of this species in the solid state. The distorted trigonal planar coordination environment observed for this species is common to these species. The Cu-O distances are significantly different within the limits of error on the data possibly as a result of inductive effects of the different β-diketonate substituents. Hot- and cold-wall chem. vapor deposition experiments revealed that these species are generally not suitable as precursors for the deposition of copper due to their low thermal stability. While pure copper films could be deposited, as determined by Auger electron spectroscopy, from the compounds (fod)CuL, where L = PMe3, 2-butyne and BTMSA, heating the precursors to increase their vapor pressures resulted in significant thermal decomposition in the source reservoir. As a result, deposition rates of only 100 Å/min were achieved. No selectivity was observed on W vs. SiO2 substrates under the conditions employed. The other compounds, (fod)CuL, where L = 1,5-COD, VTMS, were too thermally unstable for CVD experiments

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: (S)-Propane-1,2-diamine dihydrochloride, is researched, Molecular C3H12Cl2N2, CAS is 19777-66-3, about A new and facile route for the synthesis of chiral 1,2-diamines and 2,3-diamino acids, the main research direction is asym synthesis diamine diamino acid ring opening imidazolidinone hydrolysis; chiral imidazolidinone crystal mol structure.Formula: C3H12Cl2N2.

The synthesis of chiral diamines and diamino acids has been achieved from the corresponding N-arylsulfonyl aziridines through reaction with a chiral isocyanate and subsequent hydrolysis of 2-imidazolidinones. The method appears to be general and of wide applicability.

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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: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, is researched, Molecular C38H34N2O4P2, CAS is 221012-82-4, about Nickel-catalyzed enantioselective allylic alkylation of lactones and lactams with unactivated allylic alcohols.Reference of (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine.

The first nickel-catalyzed enantioselective allylic alkylation of lactone and lactam substrates to deliver α-quaternary lactones and lactams bearing an all-carbon quaternary stereocenter I [X = O, N-Bz, R1 = Me, Et; R2 = H, Ph, 2-furanyl, etc.] was reported. The reaction, which utilize a com. available chiral bisphosphine ligand, proceeded in good yield with a high level of enantioselectivity (up to 90% ee) on a range of unactivated allylic alcs. for both lactone and lactam nucleophiles. The utility of this method was further highlighted via a number of synthetically useful product transformations.

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Quinoxaline – Wikipedia,
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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: 1-(Bromomethyl)-4-ethylbenzene, is researched, Molecular C9H11Br, CAS is 57825-30-6, about Bifunctional N-aminopyridinium reagents enable C-H amination, olefin carboamination cascades.Quality Control of 1-(Bromomethyl)-4-ethylbenzene.

C-H amination reactions provide streamlined access to nitrogen-containing small mols. Here, we disclose benzylic C-H amination with N-aminopyridiniums, which are bifunctional reagents that provide avenues for further diversification. Reductive activation of the incipient N-N bonds unveils electrophilic N-centered radicals, which can be engaged by nucleophilic partners such as olefins, silyl enol ethers, and electron-rich eterocycles. We highlight the synthetic potential of these sequences in the synthesis of tetrahydroisoquinolines, which are important heterocycles in mol. therapeutics, via anti-Markovnikov olefin carboamination. Unlike many C-H amination reactions that provide access to protected amines, the current method installs an easily diversifiable synthetic handle that serves as a lynchpin for C-H amination, deaminative N-N functionalization sequences.

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Reference of 1-(Bromomethyl)-4-ethylbenzene. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 1-(Bromomethyl)-4-ethylbenzene, is researched, Molecular C9H11Br, CAS is 57825-30-6, about The nucleophilic silyl radical: dual-parameter correlation analysis of the relative rates of bromine-atom abstraction reactions as measured by a rigorous methodology. Author is Jiang, Xi-Kui; Ding, William Fa-Xiang; Zhang, Yu-Huang.

The relative rates [kR(Y)values] of bromine-atom abstraction reactions of 13 p-Y-substituted benzyl bromides (Y = H, Et, tBu, Me3Si, MeS, Ph, F, Cl, Br, CF3, CN, CO2Me, SO2Me) by tris(trimethylsilyl)silyl radicals [(Me3Si)3Si•] in cyclohexane at 80 ° have been measured by a rigorous methodol. Correlation anal. of the kinetic data by the dual-parameter equation (log kY/kH = ρxσ+ρ•σ•) shows that the silyl radical is distinctly nucleophilic and the transition states of the bromine-atom abstraction reactions are affected by both the polar and spin-delocalization effects of the Y-substituents. Comparison of the |ρp/ρJJ•| values suggests that the contribution of the spin-delocalization effects in this Br-atom abstraction reaction may be greater than the spin-delocalization effects in some H-atom abstraction reactions.

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Quinoxaline – Wikipedia,
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Computed Properties of F2H8NiO4. 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: Nickel(ii)fluoridetetrahydrate, is researched, Molecular F2H8NiO4, CAS is 13940-83-5, about Highly Selective Biaryl Cross-Coupling Reactions between Aryl Halides and Aryl Grignard Reagents: A New Catalyst Combination of N-Heterocyclic Carbenes and Iron, Cobalt, and Nickel Fluorides. Author is Hatakeyama, Takuji; Hashimoto, Sigma; Ishizuka, Kentaro; Nakamura, Masaharu.

Combinations of N-heterocyclic carbenes (NHCs) and fluoride salts of the iron-group metals (Fe, Co, and Ni) have been shown to be excellent catalysts for the cross-coupling reactions of aryl Grignard reagents (Ar1MgBr) with aryl and heteroaryl halides (Ar2X) to give unsym. biaryls (Ar1-Ar2). Iron fluorides in combination with SIPr (1,3-bis(2,6-diisopropylphenyl)imidazolinium hydrochloride), a saturated NHC ligand, catalyze the biaryl cross-coupling between various aryl chlorides and aryl Grignard reagents in high yield and high selectivity. On the other hand, cobalt and nickel fluorides in combination with IPr (1,3-bis(2,6-diisopropylphenyl)imidazolium hydrochloride), an unsaturated NHC ligand, exhibit interesting complementary reactivity in the coupling of aryl bromides or iodides; in contrast, with these substrates the iron catalysts show a lower selectivity. The formation of homocoupling byproducts is suppressed markedly to less than 5% in most cases by choosing the appropriate metal fluoride/NHC combination. The present catalyst combinations offer several synthetic advantages over existing methods: practical synthesis of a broad range of unsym. biaryls without the use of palladium catalysts and phosphine ligands. On the basis of stoichiometric control experiments and theor. studies, the origin of the unique catalytic effect of the fluoride counterion can be ascribed to the formation of a higher-valent heteroleptic metalate [Ar1MF2]MgBr as the key intermediate in our proposed catalytic cycle. First, stoichiometric control experiments revealed the stark differences in chem. reactivity between the metal fluorides and metal chlorides. Second, DFT calculations indicate that the initial reduction of di- or trivalent metal fluoride in the wake of transmetalation with PhMgCl is energetically unfavorable and that formation of a divalent heteroleptic metalate complex, [PhMF2]MgCl (M = Fe, Co, Ni), is dominant in the metal fluoride system. The heteroleptic ate-complex serves as a key reactive intermediate, which undergoes oxidative addition with PhCl and releases the biaryl cross-coupling product Ph-Ph with reasonable energy barriers. The present cross-coupling reaction catalyzed by iron-group metal fluorides and an NHC ligand provides a highly selective and practical method for the synthesis of unsym. biaryls as well as the opportunity to gain new mechanistic insights into the metal-catalyzed cross-coupling reactions.

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Niu, Weiling; Chen, Li; Hu, Jiayuan; Chen, Hua; Li, Xianjun published the article 《Asymmetric hydroformylation of styrene catalyzed by P-Phos-Rh complexes [P-Phos = 4,4′,6,6′-tetramethoxy-2,2′-bis(diphenylphosphino)-1,1′-bipyridine]》. Keywords: styrene asym hydroformylation catalyst rhodium chiral diphosphine.They researched the compound: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine( cas:221012-82-4 ).SDS of cas: 221012-82-4. 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:221012-82-4) here.

Rh complex was prepared by complexation of (R)-P-Phos with the available Rh precursor and used for the asym. hydroformylation of styrene. The effects of total pressure, temperature, and the ratio of phosphine/Rh on catalytic activity, chemo- and enantioselectivity were discussed. (R)-P-Phos-Rh showed higher activity and regioselectivity and the enantioselectivity was as much as that catalyzed by -BINAP-Rh (BINAP = 2,2′-di(diphenylphosphino)-1,1′-bipyridine) in the in situ asym. hydroformylation of styrene.

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Quinoxaline – 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 《Oxine N-oxide as an analytical reagent for the colorimetric estimation of Ce(IV) and its comparison with 8-quinolinol as a chelating agent》. Authors are Bhat, A. N.; Jain, B. D..The article about the compound:8-Hydroxyquinoline 1-oxidecas:1127-45-3,SMILESS:OC1=CC=CC2=CC=C[N+]([O-])=C12).Quality Control of 8-Hydroxyquinoline 1-oxide. Through the article, more information about this compound (cas:1127-45-3) is conveyed.

Aqueous solutions of Ce(IV) salts form stable brownish red H2O-soluble complexes when combined with alc. oxine N-oxide. The absorption is measured at 420 mμ, and Beer’s law is obeyed to 9.0 p.p.m. Ce. Th, U, and F- interfere and must be removed.

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Quinoxaline – Wikipedia,
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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: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, is researched, Molecular C38H34N2O4P2, CAS is 221012-82-4, about Air-stable Ir-(P-Phos) complex for highly enantioselective hydrogenation of quinolines and their immobilization in poly(ethylene glycol) dimethyl ether (DMPEG).Computed Properties of C38H34N2O4P2.

An air-stable catalyst system Ir-(P-Phos) catalyst was found to be highly effective in the asym. hydrogenation of quinoline derivatives The catalyst immobilized in DMPEG was efficiently recovered and reused eight times, retaining reactivity and enantioselectivity.

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Quinoxaline – Wikipedia,
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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.Blanco, Victor; Abella, Dolores; Pia, Elena; Platas-Iglesias, Carlos; Peinador, Carlos; Quintela, Jose M. researched the compound: (4-(Pyridin-4-yl)phenyl)methanol( cas:217192-22-8 ).Recommanded Product: (4-(Pyridin-4-yl)phenyl)methanol.They published the article 《Regioselective Catenation of Dinuclear Palladium and Platinum Metallocycles Promoted by π···π Interactions》 about this compound( cas:217192-22-8 ) in Inorganic Chemistry. Keywords: regioselective catenation palladium platinum metallocycle macrocyclic polyether pi interaction; catenane palladium platinum pyridylbenzylbipyridinium metallocycle macrocyclic polyether preparation; inclusion palladium pyridylbenzylbipyridinium metallocycle aromatic alc. We’ll tell you more about this compound (cas:217192-22-8).

Dinuclear metallocycles were assembled from an L-shaped bidentate ligand based on 4,4′-bipyridine and Pd or Pt square-planar cis complexes. The Pd (4a,b) or Pt (5a,b) square metallocycles, I6+ and II6+ (M = Pd, Pt, as NO3- (a) and PF6- (b) salts, resp.), were obtained as 1:1 regioisomeric mixtures depending on which pair of coordinative N atoms binds to the metal center. The squares display a π-deficient cavity suitable to incorporate two π-donor aromatic systems. Therefore, the reaction with macrocyclic polyethers (BPP34C10 or DN38C10) resulted in the regioselective self-assembly of the [3]catenanes 4a(BPP34C10 or DN38C10)2·6PF6 and 5a(BPP34C10 or DN38C10)2·6PF6 because only macrocycles 4a and 5a present the correct disposition of the π-deficient aromatic systems to maximize the π···π stacking interactions. Single-crystal x-ray analyses of [3]catenanes revealed that the structures are addnl. stabilized by [C-H···O], [N-H···O] bonds and [C-H···π] interactions. The 1:2 inclusion complexes of metallocycles were prepared by self-assembly of three components: the ligand 1-(4-(pyridin-4-yl)benzyl)-4,4′-bipyridin-1-ium, a square planar complex M(en)(NO3)2 (M = Pd or Pt, en = ethylenediamine), and a dioxoarom. guest in a 2:2:2 ratio. The comparative study of the formation of 1:2 inclusion complexes has allowed the authors to conclude that the π···π interactions between the host and guests are responsible for the observed regioselectivity.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider