Day: April 11, 2022

Barreiro, Elena M.; Boltukhina, Ekaterina V.; White, Andrew J. P.; Hii, King Kuok published the article 《Atropisomeric [(diphosphine)Au2Cl2] Complexes and their Catalytic Activity Towards Asymmetric Cycloisomerisation of 1,6-Enynes》. Keywords: enyne cycloisomerization stereoselective diphosphine gold catalyst; aurophilicity; catalysis; cycloisomerization; enynes; gold.They researched the compound: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine( cas:221012-82-4 ).HPLC of Formula: 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.

X-ray crystal structures of two [(diphosphine)Au2Cl2] complexes (in which diphosphine = P-Phos and xylyl-P-Phos; P-Phos = [2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine]) were determined and compared to the reported structures of similar atropisomeric gold complexes. Correlations between the Au-Au distances and torsional angles for the biaryl series of ligands (MeOBIPHEP, SEGPhos, and P-Phos; BIPHEP = 2,2′-bis(diphenylphosphino)-1,1′-biphenyl, SEGPhos = [(4,4′-bi-1,3-benzodioxole)-5,5′-diyl]bis[diphenylphosphine]) can be made; these measurements appear to be very dependent upon the phosphorus substituent. Conversely, the same effect was not observed for ligands based on the binaphthyl (BINAP) series. The catalytic activity of these complexes was subsequently assessed in the enantioselective cycloisomerization of 1,6-enynes ArCCCH2OCH2CH:CHC6H5 (Ar = 4-O2NC6H4, 3-CH3OC6H4, C6H5, 4-CH3C6H4) and revealed an over-riding electronic effect: more-electron-rich phosphines promote greater enantioselectivity. The possibility of silver acting as a (co-) catalyst was ruled out in these reactions.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Product Details of 13940-83-5. 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: Nickel(ii)fluoridetetrahydrate, is researched, Molecular F2H8NiO4, CAS is 13940-83-5, about Chemical transformations of crystal hydrates of iron, cobalt, and nickel fluorides on heating.

Heating FeF2.4H2O in Ar or CoF2.4H2O and NiF2.H2O in Ar or air caused dehydration and partial hydrolysis of the products. Fe2F4O formed on heating FeF2.4H2O in O or air. The temperature of dehydration increased with decreasing ionic radius of metal ions.

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Quinoxaline – Wikipedia,
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Recommanded Product: 8-Hydroxyquinoline 1-oxide. 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: 8-Hydroxyquinoline 1-oxide, is researched, Molecular C9H7NO2, CAS is 1127-45-3, about The oxidation of pyridines catalyzed by surfactant-encapsulated polyoxometalate [(C18H37)2(CH3)2N]8[HBW11O39] with the temperature-responsive property of solubility. Author is Zhao, Wei; Yang, Chunxia; Ding, Yong; Ma, Baochun.

Temperature-responsive characterization of solubility based on a surfactant-encapsulated polyoxometalate ([(C18H37)2(CH3)2N]8[HBW11O39]) in tert-Bu alc. was described and used in catalytic oxidation of pyridines. The catalyst could be recovered and reused several times by controlling the temperature

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Quinoxaline – Wikipedia,
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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 1-(Bromomethyl)-4-ethylbenzene(SMILESS: CCC1=CC=C(CBr)C=C1,cas:57825-30-6) is researched.Quality Control of 8-Hydroxyquinoline 1-oxide. The article 《Incorporation of Cobalt-Cyclen Complexes into Templated Nanogels Results in Enhanced Activity》 in relation to this compound, is published in Chemistry – A European Journal. Let’s take a look at the latest research on this compound (cas:57825-30-6).

Recent advances in nanomaterials have identified nanogels as an excellent matrix for novel biomimetic catalysts using the mol. imprinting approach. Polymerisable Co-cyclen complexes with phosphonate and carbonate templates were prepared, fully characterized and used to obtain nanogels that show high activity and turnover with low catalytic load, compared to the free complex, in the hydrolysis of 4-nitrophenyl phosphate, a nerve agent simulant. The chem. structure of the template has an impact on the coordination geometry and oxidation state of the metal center in the polymerisable complex resulting in very significant changes in the catalytic properties of the polymeric matrix. Both pseudo-octahedral Co(III) and trigonal-bipyramidal Co(II) structures were used for the synthesis of imprinted nanogels, and the catalytic data demonstrate that: (i) the imprinted nanogels can be used in 15% load and show turnover; (ii) the structural differences in the polymeric matrixes resulting from the imprinting approach with different templates are responsible for the mol. recognition capabilities and the catalytic activity. Nanogel P1, imprinted with the carbonate template, shows > 50% higher catalytic activity than P2 imprinted with the phosphonate.

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Quinoxaline – Wikipedia,
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Petitjean, Anne; Kyritsakas, Nathalie; Lehn, Jean-Marie published an article about the compound: 8-Hydroxyquinoline 1-oxide( cas:1127-45-3,SMILESS:OC1=CC=CC2=CC=C[N+]([O-])=C12 ).Quality Control of 8-Hydroxyquinoline 1-oxide. 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:1127-45-3) through the article.

Mol. devices capable of accessing different controlled conformational states, while optically signaling the occupied state, are attractive tools for nanotechnol. since they relate to both areas of mol. mech. devices and logic gates. The authors report here a simple mol. system that allows access to four distinct conformational and optical states. It is based on the regioselective complexation of metal ions to a heterocyclic ligand triad, which is dictated by the accessible coordination geometry and electrostatic properties of two distinct binding subunits. Thus, local conformational switching is brought about by tetrahedral coordination (of CuI) or octahedral coordination (of M2+ ions) to bidentate and tridentate binding subunits, resp. The shape modifications undergone represent an ion-controlled nanomech. device. They give controlled access to four different states that display different physicochem. (e.g. optical) properties and provide a basis for logic gate operations.

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Quinoxaline – Wikipedia,
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Khurana, Jitender M.; Maikap, Golak C. published the article 《Bromomethylation of aromatics mediated by low frequency ultrasound》. Keywords: ultrasound aromatic bromomethylation.They researched the compound: 1-(Bromomethyl)-4-ethylbenzene( cas:57825-30-6 ).Product Details of 57825-30-6. 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:57825-30-6) here.

Bromomethylation of aromatics mediated by low frequency ultrasound yielded bromomethylated aromatic rings which are useful synthetic intermediates. E.g., PhMe was bromomethylated with paraformaldehyde, 48% aqueous HBr and glacial HOAc on exposure to ultrasound to give 90% 4-methylbenzyl bromide. Among the 7 other compounds similarly prepared were 93% 2,5-dimethylbenzyl bromide, 93% 4-ethylbenzyl bromide, 92% 1-bromomethylnaphthalene and 95% 1-bromomethyl-2-methylnaphthalene.

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Quinoxaline – Wikipedia,
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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 Benzylation of heterocyclic N-oxides via direct oxidative cross-dehydrogenative coupling with toluene derivatives, published in 2016, which mentions a compound: 1127-45-3, Name is 8-Hydroxyquinoline 1-oxide, Molecular C9H7NO2, Application In Synthesis of 8-Hydroxyquinoline 1-oxide.

A novel cross-dehydrogenative coupling (CDC) of heterocyclic N-oxides with toluene derivatives has been discussed, allowing for the facile synthesis of a broad range of structurally diverse C1-benzyl quinoline N-oxides, isoquinoline N-oxides and pyridine N-oxides, including two methylated quinoline N-oxides in particular. This protocol not only extends the application of toluenes in synthetic organic chem., but also offers an alternative method to prepare benzylated heterocyclic N-oxides without any metal involved, which is important in medicinal chem.

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Quinoxaline – Wikipedia,
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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: (S)-Propane-1,2-diamine dihydrochloride(SMILESS: C[C@H](N)CN.[H]Cl.[H]Cl,cas:19777-66-3) is researched.Formula: C9H7NO2. The article 《HPLC detection and evaluation of chiral compounds with a laser-based chiroptical detector》 in relation to this compound, is published in LC-GC. Let’s take a look at the latest research on this compound (cas:19777-66-3).

The sensitivity and ruggedness of chiroptical detectors have improved considerably during the past decade. The authors examine >230 chiral compounds using the latest laser-based polarimetry detector for HPLC. They also examine the relation between optical rotation at the detector wavelength of 675 nm and the sodium D line. The authors consider the sensitivity, linear dynamic range, and effect of solvent composition on rotation and its general use as an HPLC detector for chiral compounds

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Quinoxaline – Wikipedia,
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Yang, Yan; Zhou, Zhen; Wei, Zu-Zhuang; Qin, Qi-Pin; Yang, Lin; Liang, Hong published an article about the compound: 8-Hydroxyquinoline 1-oxide( cas:1127-45-3,SMILESS:OC1=CC=CC2=CC=C[N+]([O-])=C12 ).Formula: C9H7NO2. 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:1127-45-3) through the article.

In the quest for rare earth metal complexes with enhanced cancer chemotherapeutic properties, the discovery of seven lanthanide(III) complexes bearing 8-hydroxyquinoline-N-oxide (NQ) and 1,10-phenanthroline (phen) ligands as potential anticancer drugs is described. Complexes [SmIII(NQ)(phen)(H2O)Cl2] , [EuII(NQ)(phen)(H2O)Cl2] , [GdIII(NQ)(phen)(H2O)Cl2] , [DyIII(NQ)(phen)(H2O)Cl2] , [HoIII(NQ)(phen)(H2O)Cl2] , [ErIII(NQ)(phen)(H2O)Cl2] , and [YbIII(NQ)(phen)(H2O)Cl2] exhibit high antiproliferative activity against cisplatin-resistant A549/DDP cells (IC50 = 0.025-0.097 μM) and low toxicity to normal HL-7702 cells. Moreover, complex [SmIII(NQ)(phen)(H2O)Cl2], and to a lesser extent [YbIII(NQ)(phen)(H2O)Cl2], can upregulate the expression of LC3 and Beclin1 and downregulate p62 to induce apoptosis in cisplatin-resistant A549/DDP cell lines, which is related to the cell autophagy-inducing properties of [SmIII(NQ)(phen)(H2O)Cl2] and [YbIII(NQ)(phen)(H2O)Cl2]. Furthermore, in vivo assays suggest that [SmIII(NQ)(phen)(H2O)Cl2] significantly inhibits A549/DDP xenograft tumor growth (56.5%). These results indicate that lanthanide(III) complex [SmIII(NQ)(phen)(H2O)Cl2] is a promising candidate as an anticancer drug against cisplatin-resistant A549/DDP cells.

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Quinoxaline – Wikipedia,
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Name: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine. 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: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, is researched, Molecular C38H34N2O4P2, CAS is 221012-82-4, about Asymmetric Synthesis of α-Allyl-α-Aryl α-Amino Acids by Tandem Alkylation/π-Allylation of α-Iminoesters. Author is Curto, John M.; Dickstein, Joshua S.; Berritt, Simon; Kozlowski, Marisa C..

The first asym. synthesis of α-allyl-α-aryl α-amino acids by means of a three-component coupling of α-iminoesters, Grignard reagents, and cinnamyl acetate is reported. Notably, the enolate from the tandem process provides a much higher level of reactivity and selectivity than the same enolate generated via direct deprotonation, presumably due to differences in the solvation/aggregation state. A novel method for removal of a homoallylic amine protecting group delivers the free amine congeners. The α-allyl group offers a means to generate further valuable α-amino acid structures as exemplified by ring closing metathesis to generate a higher ring homolog of α-aryl-proline.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider