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Recommanded Product: Pentaerythrityltetrabromide. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Poly[[tetrachlorido{μ4-tetrakis[(pyridin-4-yl)oxymethyl]methane-κ4 N:N’:N”:N”’}dizinc(II)] dimethylformamide tetrasolvate]. Author is Wang, Ya-Qin; Xie, Fa-Zhi; Du, Lin.

A novel metal-organic framework, {[Zn2Cl4(C25H24N4O4)].4C3H7NO}n, was synthesized solvothermally by assembling the semi-rigid tetrahedral ligand tetrakis[(pyridin-4-yl)oxymethyl]methane (tpom) and Zn(NO3)3 in DMF. Crystal data: tetragonal, P4̅21c, a = 12.2905(14), c = 16.133(4) Å, Z = 2, 2149 observed reflections with I > 2σ(I), 136 refined parameters, R[F2 > 2σ(F2)] = 0.031, wR(F2) = 0.086. Each Zn(II) cation has a tetrahedral coordination environment (C 2 symmetry), which is formed by 2 chloride ligands and two pyridine N atoms from 2 tpom ligands. The tetrahedral tetradentate tpom linker has a quaternary C atom located on the crystallog. axis. This linker utilizes all the peripheral pyridine N atoms to connect 4 Zn(II) cations, thereby forming a wave-like 2-dimensional sheet along the c axis. The 2D layer can be topol. simplified as a typical uninodal 4-connected sql/Shubnikov net, which is represented by the Schlaefli symbol {44,62}. Adjacent layers are further packed into a 3D structure by C-H…Cl H-bonds.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Reference of Pentaerythrityltetrabromide. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Tetrakis[(1-phenyltetrazol-5-yl)sulfanylmethyl]methane. Author is Lyakhov, Alexander S.; Zatsepina, Marina V.; Artamonova, Tatiana V.; Gaponik, Pavel N.; Koldobskii, Grigorii I..

Tetrakis[(1-phenyltetrazol-5-yl)sulfanylmethyl]methane, C33H28N16S4, prepared by the divergent method, presents a core unit for further synthesis of tetrazole-containing dendrimers. The central C atom lies on a crystallog. 2-fold rotation axis. π-π Interactions and weak nonclassical C-H···N H bonds are responsible for the formation of layers parallel to the bc plane, with van der Waals interactions between them.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Venkatraman, B. Harihara; Chaudhuri, PiyaliD.; Yurt, Serkan; Venkataraman, D. published an article about the compound: Pentaerythrityltetrabromide( cas:3229-00-3,SMILESS:BrCC(CBr)(CBr)CBr ).Synthetic Route of C5H8Br4. 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:3229-00-3) through the article.

In this paper, we show a common strategy to synthesize tetraalkenylmethanes, a cross-linker series for building three-dimensional hydrocarbon networks. To demonstrate the feasibility of this method, we have synthesized tetrapentenylmethane. Attempts to synthesize this cross-linker from pentaerythrityl tetrabromide using substitution reactions resulted in the formation of a spiro compound due to intramol. cyclization. We also show that the difficulty in reactions at the neopentyl carbon site is due to the neopentyl carbanion stability, not the sterics.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Pentaerythrityltetrabromide( cas:3229-00-3 ) is researched.Name: Pentaerythrityltetrabromide.Rustad, Steinar; Stoelevik, Reidar published the article 《Conformational analysis. XI. The molecular structure, torsional oscillations, and conformational equilibria of gaseous tetrakis(bromomethyl)methane, C(CH2Br)4, as determined by electron diffraction and compared with molecular-mechanics calculations》 about this compound( cas:3229-00-3 ) in Acta Chemica Scandinavica, Series A: Physical and Inorganic Chemistry. Keywords: bromomethylpropane gas mol structure vibration; propane bromomethyl gas mol structure. Let’s learn more about this compound (cas:3229-00-3).

Gaseous C(CH2Br)4 was studied by electron diffraction. Two conformers named D (D2d symmetry) and S (S4 symmetry) were detected. The results are presented with error limits (2σ). The following values for distances (rg) and angles (∠α) are appropriate for the structure of both conformers: r(C-H) = 1.09(5) Å, r(C-C) = 1.554(9) Å, r(C-Br) = 1.951(8) Å, ∠CCBr = 114.2.degree.(0.8), ∠CCH = 111.7.degree.(3.2). D and S have a tetrahedral arrangement of C atoms and all-staggered (1:2) conformations which do not possess parallel (1:3) Br···Br interactions. Torsional force constants and vibrational frequencies for both conformers were estimated The composition at 140° is 42(2) % of S and 58(2) % of D. As predicted by the mol.-mechanics calculations, conformers possessing parallel (1:3) Br···Br interactions are not present in detectable amounts To a large extent the structural parameters obtained by the mol.-mechanics calculations reasonably agree with the exptl. results.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

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: 3229-00-3, is researched, SMILESS is BrCC(CBr)(CBr)CBr, Molecular C5H8Br4Journal, Chemical Research in Chinese Universities called Molecular chirality and chiral superlattice in crystal of tetrakis[(pyrrol-1-yl)methyl]methane, Author is Wei, Xu; Lu, Yin-xiang; Liu, Chun-ming; Lan, Bi-jian; Hui, Zhou; Wang, Jing-mei, the main research direction is mol structure chirality pyrrolylmethylmethane; crystal structure pyrrolylmethylmethane.Application In Synthesis of Pentaerythrityltetrabromide.

The crystal structure of tetrakis[(pyrrol-1-yl)methyl]methane was determined by x-ray diffraction measurement, and it belongs to monoclinic crystal system, space group P21/n; with a 0.9284(3), b 1.0950(6), c 1.8749(8) nm; β 103.63(3)°, Z = 4, dc = 1.192 kg/m3, R1 = 0.0854, wR2 = 0.1884. The mols. exist in two enantiomeric states. Enantioselective self-assemblies such as 1-dimensional mol. stacks in a single handedness, homochiral monolayers and a chiral superlattice are specified in this racemic crystal. A simple technique is advocated to distinguish chiral states from tetrahedral mols. in the solid state. The present R/S nomenclature of the tetracooradinated C centers was used solely for its convenience to distinguish the two enantiomeric states, but not used to determine the absolute configurations.

Different reactions of this compound(Pentaerythrityltetrabromide)Application In Synthesis of Pentaerythrityltetrabromide require different conditions, so the reaction conditions are very important.

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Safety of Tricyclohexylphosphonium tetrafluoroborate. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Tricyclohexylphosphonium tetrafluoroborate, is researched, Molecular C18H34BF4P, CAS is 58656-04-5, about Electron-Poor Bowl-Shaped Polycyclic Aromatic Dicarboximides: Synthesis, Crystal Structures, and Optical and Redox Properties. Author is Shoyama, Kazutaka; Schmidt, David; Mahl, Magnus; Wuerthner, Frank.

Two new bowl-shaped polycyclic aromatic hydrocarbons, based on corannulene and naphthalene dicarboximide, are synthesized by an improved Suzuki-Miyaura cross-coupling and C-H arylation cascade reaction. Crystallog. analyses confirm structural assignments and provide insight into mol. interactions in the solid state. The new bowl-shaped mols. show reversible oxidation and reduction, intense visible range absorption, and high fluorescence quantum yields. These mols. can be considered bowl-shaped congeners of planar perylene dicarboximides.

After consulting a lot of data, we found that this compound(58656-04-5)Safety of Tricyclohexylphosphonium tetrafluoroborate can be used in many types of reactions. And in most cases, this compound has more advantages.

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Synthesis and crystal structure of an octahedral nickel(II) complex derived from pentaerythrityltetraamine, the main research direction is crystal structure nickel pentaerythrityltetraamine complex; electrooxidation nickel pentaerythrityltetraamine complex; oxidation nickel pentaerythrityltetraamine complex.Name: Pentaerythrityltetrabromide.

Ni(Htam)24+ (tam = pentaerythrityltetraamine) was prepared under controlled conditions. In this ion, 3 of the 4 amino groups of each ligand are coordinated to yield an octahedral structure which shows tetragonal and trigonal distortion. The 4th amino group is protonated in each case and binds strongly to the counter ion SO42-. The crystal structure (triclinic, P1̅, a 8.913(3), b 9.775(2), c 7.505(3) Å, α 102.61(4), β 106.28(4), γ 96.40(3)°) was refined, converging to R = 0.0347 and Rw = 0.0386. The 3-dimensional nature of the H bonding in the crystal structure was described. Differences in Ni-N bond lengths are observed A transient Ni(III) species is generated chem. or electrochem. The ESR spectrum is consistent with a low spin d7 center and is axial in nature.

After consulting a lot of data, we found that this compound(3229-00-3)Name: Pentaerythrityltetrabromide can be used in many types of reactions. And in most cases, this compound has more advantages.

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Ultrasensitive inkjet-printed based SERS sensor combining a high-performance gold nanosphere ink and hydrophobic paper》. Authors are Godoy, N. V.; Garcia-Lojo, D.; Sigoli, F. A.; Perez-Juste, J.; Pastoriza-Santos, I.; Mazali, I. O..The article about the compound:Hydrogen tetrachloroaurate(III) trihydratecas:16961-25-4,SMILESS:Cl[Au-](Cl)(Cl)Cl.[H]O[H].[H]O[H].[H]O[H].[H+]).Category: imidazoles-derivatives. Through the article, more information about this compound (cas:16961-25-4) is conveyed.

We report the fabrication of a low-cost paper-based SERS platform with enhanced sensing capabilities. The sensor consists of a highly concentrated glycerol/ethanol dispersion of ca. 77 nm Au nanospheres (AuSph) inkjet-printed on hydrophobic chromatog. paper forming circular sensing spots of 1 mm in diameter The AuSph ink exhibits high stability for 1 yr. Interestingly, we demonstrate that the modification of the paper surface with hydrophobic ligands improve the sensing capabilities by confining the analyte solution in the AuSph sensing platform. It contributes to both concentrate the analyte, as well as, to decrease the sample volume to just a few μl. We also analyze the effect of the amount of the nanoparticles, tunable by the number of printing cycles, in the SERS performance of the plasmonic spots. The results show that 5 printing cycles give rise to sensing platforms with great SERS response in terms of intensity and uniformity. The spot-to-spot reproducibility is also analyzed observing good results even for AuSph spots from different printed papers. The paper-based SERS platform was tested towards the detection of crystal violet (CV) and the fungicide thiram. Addnl., applying a digital protocol for SERS anal., a good linear correlation between the digital counts (or pos. events) and the analyte concentration was obtained at the single-mol. SERS regime. In both cases, the quantification region threshold was 10-11 M. The great sensitivity performance of the inkjet-printed SERS substrate is reflected by the low sample volume needed (only 2μL). The inkjet-printed SERS substrate and the fabrication method demonstrated to be efficient, reliable, reproducible and robust, with a cost less than $ 0.01 per spot.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Plasma Science & Technology (Bristol, United Kingdom) called Visualization of gold nanoparticles formation in DC plasma-liquid systems, Author is Liu, Zhaoyuan; Chen, Qiang; Liu, Qinghuo; Ostrikov, Kostya, which mentions a compound: 16961-25-4, SMILESS is Cl[Au-](Cl)(Cl)Cl.[H]O[H].[H]O[H].[H]O[H].[H+], Molecular AuCl4H7O3, Formula: AuCl4H7O3.

Dual argon plasmas ignited by one d.c. power source are used to treat an aqueous solution of hydrogen tetrachloroaurate-(III) trihydrate (HAuCl4 ·3H2O) which is contained in an H-type electrochem. cell. The solution contained in one cell acts as a cathode, and in the other as an anode. Experiments are carried out to directly visualize the formation process of gold nanoparticles (AuNPs) in separated cells of the H-type electrochem. reactor. The results and analyzes suggest that hydrogen peroxide and hydrated electrons generated from the plasma-liquid interactions play the roles of reductants in the solutions, resp. Hydrogen peroxide can be generated in the case of the liquid being a cathode or an anode, while most of hydrated electrons are formed in the case of the liquid being an anode. Therefore, the reduction of the AuCl-4 ions is mostly attributed to the hydrogen peroxide as the liquid acts as a cathode, while to the hydrogen peroxide and hydrated electrons as the liquid acts as an anode. Moreover, the pH value of the solution can be used to tune the formation processes and the final form of the AuNPs due to its mediation of reductants.

The article 《Visualization of gold nanoparticles formation in DC plasma-liquid systems》 also mentions many details about this compound(16961-25-4)Formula: AuCl4H7O3, you can pay attention to it, because details determine success or failure

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

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: 58656-04-5, is researched, Molecular C18H34BF4P, about Intramolecular Palladium-Catalyzed Alkane C-H Arylation from Aryl Chlorides, the main research direction is cyclobutarene indane indoline dihydrobenzofuran indanone preparation; alkane arylchloride intramol arylation palladium catalyst; DFT calculation computational study; arylation mechanism.Recommanded Product: 58656-04-5.

The first examples of efficient and general palladium-catalyzed intramol. C(sp3)-H arylation of (hetero)aryl chlorides, giving rise to a variety of valuable cyclobutarenes, indanes, indolines, dihydrobenzofurans, and indanones, are described. The use of aryl and heteroaryl chlorides significantly improves the scope of C(sp3)-H arylation by facilitating the preparation of reaction substrates. Careful optimization studies have shown that the palladium ligand and the base/solvent combination are crucial to obtaining the desired class of product in high yields. Overall, three sets of reaction conditions employing PtBu3, PCyp3, or PCy3 as the palladium ligand and K2CO3/DMF or Cs2CO3/pivalic acid/mesitylene as the base/solvent combination allowed five different classes of products to be accessed using this methodol. In total, more than 40 examples of C-H arylation have been performed successfully. When several types of C(sp3)-H bond were present in the substrate, the arylation was found to occur regioselectively at primary C-H bonds vs secondary or tertiary positions. In addition, in the presence of several primary C-H bonds, selectivity trends correlate with the size of the palladacyclic intermediate, with five-membered rings being favored over six- and seven-membered rings. Regio- and diastereoselectivity issues were studied computationally in the prototypal case of indane formation. DFT(B3PW91) calculations demonstrated that C-H activation is the rate-determining step and that the creation of a C-H agostic interaction, increasing the acidity of a geminal C-H bond, is a critical factor for the regiochem. control.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem