Month: April 2022

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 1-(Bromomethyl)-4-iodobenzene, is researched, Molecular C7H6BrI, CAS is 16004-15-2, about Design and synthesis of cinchona-based chiral hyperbranched polymers and their application in asymmetric reactions, the main research direction is cinchona chiral hyperbranched polymer catalyst preparation diastereoselectivity enantioselectivity addition.Application of 16004-15-2.

Cinchona-based chiral hyperbranched polymers (HBPs) were designed and successfully synthesized via the Mizoroki-Heck (MH) coupling reaction. AB2 and A2B-type chiral monomers were prepared from cinchona squaramide derivatives, where A (vinyl) reacted only with B (iodophenyl) under MH reaction conditions. The chiral HBPs obtained by the MH polymerization contained cinchona squaramide moieties and demonstrated excellent diastereoselectivity and enantioselectivity in asym. Michael addition reactions of Me 2-oxocyclopentanecarboxylate and trans-β-nitrostyrene. These newly designed HBPs were structurally robust and could be reused for further reaction without losing their catalytic activity.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 1,10-Phenanthroline(SMILESS: C1=CC3=C(C2=NC=CC=C12)N=CC=C3,cas:66-71-7) is researched.Quality Control of 2,4-Dimethyl-1H-pyrrole. The article 《Synthesis, spectroscopic characterization, crystal structure, Hirshfeld surface analysis, linear and NLO properties of new hybrid compound based on tin fluoride oxalate and organic amine molecule (C12N2H9)2[SnF2(C2O4)2]2H2O》 in relation to this compound, is published in Journal of Molecular Structure. Let’s take a look at the latest research on this compound (cas:66-71-7).

A novel hybrid compound based on tin fluoride of bis 1,10-phenanthrolinium cis- difluoro bisoxalatestannate (IV) dihydrate formulated as [(C12N2H9)2[SnF2(C2O4)2]2H2O] was synthesized and characterized by powder and single XRD, IR and UV-visible spectroscopy. The title compound crystallizes in the tricilinc system, P1 space group with a 7.7863(2), b 9.8814(2), c 19.2398(5) Å, α 103.196(1), β 94.695(1), γ 99.723(1)°. Their crystal structure can be described as an alternation between organic and inorganic layers along the axis. The structure stabilized by hydrogen bonding via the different entities for to form a three-dimensional network. The behavior of different intermol. interactions was studied using Hirshfeld surface. The powder XRD data confirms the phase purity of the crystalline sample. The vibrational absorption bands were identified by IR spectrum and confirmed the presence of the different groups present in the structure. The optical properties of the crystal were studied by using optical absorption in UV-visible spectrum. To elucidate the nonlinear optical (NLO) activity of the novel hybrid compound, d. functional theory (DFT) method at different functionals (B3LYP, CAM-B3LYP, ωB97X-D, and M06-2X) was used to calculate their dipole moment, linear polarizability, and first hyperpolarizability. The resulting compound shows a high hyper-Rayleigh scattering (HRS) first hyperpolarizability, which makes it suitable for optoelectronic and optical devices.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

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 Slow relaxation of Dy(III) single-ion magnets dominated by the simultaneous binding of chelating ligands in low-symmetry ligand-fields, published in 2022, which mentions a compound: 66-71-7, mainly applied to dysprosium bipyridine phen salicylaldoxime complex preparation crystal structure magnetism, Name: 1,10-Phenanthroline.

Electronic effect and geometry distortion of low-symmetry ligand-field on the anisotropy barrier (Ueff) of spin reversal were compared in three Dy(III) single-ion magnets through the simultaneous binding of chelating ligands. The substitution of N,O-salicylaldoxime by N,N’-1,10-phenanthroline in the distorted triangular-dodecahedronal field sharply decreases the Ueff by 286 K due to an increase in nonpreferred transverse anisotropy, while the geometry distortion with CShM = 1.569 went down to 1.376 only lowering the Ueff by 12 K. The co-coordination strategy of heterodonor ligands highlights the importance of ligand-surroundings on the relaxation dynamics.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

COA of Formula: C12H8N2. 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: 1,10-Phenanthroline, is researched, Molecular C12H8N2, CAS is 66-71-7, about One-Step Preparation of Fe/N/C Single-Atom Catalysts Containing Fe-N4 Sites from an Iron Complex Precursor with 5,6,7,8-Tetraphenyl-1,12-Diazatriphenylene Ligands. Author is Matsumoto, Koki; Kato, Masaru; Yagi, Ichizo; Xie, Siqi; Asakura, Kiyotaka; Noro, Shin-ichiro; Tohnai, Norimitsu; Campidelli, Stephane; Hayashi, Takashi; Onoda, Akira.

Fe/N/C single-atom catalysts containing Fe-Nx sites prepared by pyrolysis are promising cathode materials for fuel cells and metal-air batteries due to their high oxygen reduction reaction (ORR) activities. The authors have developed iron complexes containing N2- or N3-chelating coordination structures with preorganized aromatic rings in a 1,12-diazatriphenylene framework tethering bromo substituents as precursors to precisely construct Fe-N4 sites in an Fe/N/C catalyst. One-step pyrolysis of the iron complex with carbon black forms atomically dispersed Fe-N4 sites without iron aggregates. X-ray absorption spectroscopy (XAS) and electrochem. measurements revealed that the iron complex with N3-coordination is more effectively converted to Fe-N4 sites catalyzing ORR with a TOF value of 0.21 e site-1 s-1 at 0.8V vs. RHE. This indicates that the formation of Fe-N4 sites is controlled by precise tuning of the chem. structure of the iron complex precursor.

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Reference:
Piperazine – Wikipedia,
Piperazines – 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: 1,10-Phenanthroline( cas:66-71-7 ) is researched.SDS of cas: 66-71-7.Selmi, Ahmed; Omezzine, Marwene; Mahmoudi, Riadh M.; Puschmann, Horst; Ennaceur, Nasreddine published the article 《Structural, Spectroscopic, Antiferromagnetic and in vitro antiproliferative studies of copper(II) pyrophosphate complex against Human breast cancer cell lines》 about this compound( cas:66-71-7 ) in Journal of Molecular Structure. Keywords: bipyridine phenanthroline copper pyrophosphate preparation crystal mol structure antitumor. Let’s learn more about this compound (cas:66-71-7).

In purpose to search for compounds of biol. interest, authors have succeeded in synthesizing a copper complex with polypyridine ligands. The architecture of the compound consists of O,N-donor entities, the pyrophosphate anion HP2O3-7 and the two heterocyclic mols., 1,10-phenanthroline and 2,2′-bipyridine. X-ray diffraction study proves that their compound crystallizes in a monoclinic cell of space group P21/n. The at. arrangement can be described by the aggregation of [(C10H8N2)(C12H10N2)Cu2(H2O)2(HP2O7)]+ cation, which contributes to the macrocyclic compound-complex. The second sphere of the cationic complex is localized the anion ClO-4 to complete the neutrality. Magnetic studies show an antiferromagnetic coupling exchange between metal copper ions which mediated throw neighboring oxygen atom belonging from the pyrophosphate anion. The biol. antiproliferative activity of the sample shows a relatively high cytotoxicity IC50 resp. toward MCF-7 breast cancer cell lines.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

HPLC of Formula: 53562-86-0. 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: (S)-Methyl 3-hydroxybutanoate, is researched, Molecular C5H10O3, CAS is 53562-86-0, about Cationic BINAP-Ru(II) Halide Complexes: Highly Efficient Catalysts for Stereoselective Asymmetric Hydrogenation of α- and β-Functionalized Ketones. Author is Mashima, Kazushi; Kusano, Koh-hei; Sato, Naomasa; Matsumura, Yoh-ichi; Nozaki, Kyoko; Kumobayashi, Hidenori; Sayo, Noboru; Hori, Yoji; Ishizaki, Takero.

Cationic ruthenium-BINAP complexes of the formula [RuX[(S)-BINAP](arene)]Y, where X = Cl, Br, I; Y = Cl, Br, I, BF4, B(C6H5)4; arene = benzene, p-cymene, Et benzoate, and their enantiomers have been prepared by the reaction of arene-ruthenium halide complexes with (S)-BINAP or (R)-BINAP [BINAP = 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl]. Structures of the complexes were established by spectroscopy, conductivity, and a single-crystal x-ray anal. BINAP derivatives with various substituents at the para and meta positions of four Ph rings on phosphorus atoms and their cationic Ru(II) complexes have also been synthesized. These BINAP-Ru(II) complexes have been used as catalysts for the asym. hydrogenation of various unsaturated organic compounds such as α- and β-keto esters, allylic alcs., and α,β-unsaturated carboxylic acids in excellent diastereo- and/or enantioselectivities. Catalytic activities and stereoselectivities depend highly on reaction conditions such as solvent, temperature, and additives. Variation of halogen ligands bound to ruthenium atom and substituents on four Ph rings of BINAP also have exerted remarkable effects on the efficiency of the catalysis. Asym. hydrogenation of methyl(±)-2-(benzamidomethyl)-3-oxobutanoate catalyzed by the species derived from [RuI2(p-cymene)]2 and 3,5-(Me3C)2-BINAP afforded the corresponding syn-(2S,3R)-I in 98% de and 99% ee.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

Yu, Haihuan; Liu, Qun; Fan, Mingyue; Sun, Jing; Su, Zhong-Min; Li, Xiao; Wang, Xinlong published an article about the compound: 1,10-Phenanthroline( cas:66-71-7,SMILESS:C1=CC3=C(C2=NC=CC=C12)N=CC=C3 ).Computed Properties of C12H8N2. 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:66-71-7) through the article.

Metal organic framework-based mixed matrix membranes and ratiometric fluorescent sensors have received significant attention in application of sensing. Herein, a two-dimensional europium-based metal organic frameworks, [Eu(L-N2)2·(L-Cl4)1.5·H2O] (CUST-506). (L-Cl4 = 2,3,5,6-tetrachloroterephthalic acid, L-N2 = 1,10-phenanthroline) has been synthesized and characterized. Then, by immobilizing water-stable CUST-506 into agarose hydrogels, the Eu-MOF-based mixed matrix membranes (CUST-506-based MMMs) were successfully prepared The CUST-506-based MMMs exhibit not only the integrity and the metronidazole, picric acid (PA) sensing nature of Eu-MOF powder, but also excellent processability. Moreover, the Eu-MOF-based MMMs show distinguished water-stability. More interestingly, during the hydrothermal synthesis process, through anchoring the formic acid into the framworks to break the sym. coordination environment of the CUST-506, a one dimensional (1D) compound {[Eu(L-N2)·(L-Cl4)0.5(COOH)·2H2O]·(L-Cl4)0.5}(CUST-507) with two emission centers from Eu3+-based centers and free L-Cl4 mols. is generated. CUST-507 displayes a unique ability of auto-calibration effect based on the dual emission mechanism and sensitive sensing of metronidazole and picric acid. This work highlights a simple fabrication strategy for MOF-based mixed matrix membranes and overcomes the environmental interference for ratiometric fluorescent sensor.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

HPLC of Formula: 18583-60-3. 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: Potassiumtris(1-pyrazolyl)borohydride, is researched, Molecular C9H10BKN6, CAS is 18583-60-3, about Phosphorescent 2-, 3- and 4-coordinate cyclic (alkyl)(amino)carbene (CAAC) Cu(I) complexes. Author is Hamze, Rasha; Jazzar, Rodolphe; Soleilhavoup, Michele; Djurovich, Peter I.; Bertrand, Guy; Thompson, Mark E..

The photophys. properties of several Cu(I) complexes coordinated with cyclic (alkyl)(amino)carbene (CAAC) ligands were examined All the compounds were found to be phosphorescent, regardless of whether they are 2-, 3- or 4-coordinated. Aggregate and excimer emission were observed from 2-coordinate CAAC-CuCl derivatives in methylcyclohexane solution Emission from the complex 4-coordinated with a trispyrazolylborate ligand is red-shifted with respect to both the chloro-derivative and an analogous complex with an NHC ligand.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

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 Purification and characterization of a novel keto ester reductase from Candida parapsilosis, published in 1992, which mentions a compound: 53562-86-0, Name is (S)-Methyl 3-hydroxybutanoate, Molecular C5H10O3, Related Products of 53562-86-0.

The purification and characterization of a novel NADH-dependent keto ester reductase from Candida parapsilosis is reported and the applicability of this enzyme in a coupled enzyme system with cofactor regeneration is demonstrated. The system catalyzes the stereospecific reduction of Me acetoacetate.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

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: 53562-86-0, is researched, Molecular C5H10O3, about Studies of co-modifier and carboxylic acid for the enantio-differentiating hydrogenation of 2-octanone over a tartaric acid in situ modified nickel catalyst, the main research direction is hydrogenation octanone tartarate nickel catalyst sodium pivalate.Product Details of 53562-86-0.

The effects of a co-modifier and carboxylic acid on the hydrogenation rate and the enantio-differentiating ability (e.d.a.) were studied for the hydrogenation of 2-octanone and Me acetoacetate over a tartaric acid modified reduced nickel catalyst. For the hydrogenation of 2-octanone, tartaric acid, pivalic acid, and Na+ were necessary for the appearance of the predominant e.d.a. Sodium pivalate, instead of the typical co-modifier, NaBr, was appropriate for the in situ modification of reduced nickel. The use of sodium pivalate resulted in a higher hydrogenation rate and e.d.a.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics