Tag: M.W:200-300

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis of 4-Acylchromene via Highly Chemoselective Iodine-Catalyzed Cyclization of Alkynylarylether Dimethylacetals》. Authors are Rodphon, Warabhorn; Thongsornkleeb, Charnsak; Tummatorn, Jumreang; Ruchirawat, Somsak.The article about the compound:2-Bromopriopionaldehydediethylacetalcas:3400-55-3,SMILESS:CC(Br)C(OCC)OCC).Electric Literature of C7H15BrO2. Through the article, more information about this compound (cas:3400-55-3) is conveyed.

A metal-free method for the synthesis of 4-acylchromene derivatives I [R1 = Ph, 4-MeC6H4, 4-FC6H4, etc.; R2 = H, 6-Cl, 7-OMe, etc.] and II [R3 = H, Me, CH2Cl; R4 = H, Me] via highly chemoselective iodine-catalyzed cyclization of alkynylarylether dimethylacetals was reported. A combination of acetone and catalytic I2 lead to selective activation of acetal in alkynylarylether dimethylacetal substrates while alkyne moiety remained intact. Also this method was a safe, cost-effective, convenient and environmentally-friendly.

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Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Potassiumtris(1-pyrazolyl)borohydride, is researched, Molecular C9H10BKN6, CAS is 18583-60-3, about Synthesis and Reactivity of [TpRh(PPh3)2] (Tp = Hydridotris(pyrazol-1-yl)borate), the main research direction is rhodium hydridotris pyrazolylborate phosphine preparation reactivity; crystal structure hydridotrispyrazolylborate rhodium phosphine complex; mol structure hydridotrispyrazolylborate rhodium phosphine complex.Product Details of 18583-60-3.

The new complex [TpRh(PPh3)2] (I), readily obtained from [RhCl(PPh3)3] and KTp, is a particularly convenient and versatile entry point into the organometallic chem. of the “”TpRh”” fragment including complexes bearing alkyne, alkene, carbene, thiocarbamoyl, dithioalkoxycarbonyl, carbon disulfide, and vinyl ligands. Thus, reaction of I with di-Me acetylenedicarboxylate, N,N-dimethylthiocarbamoyl chloride, or carbon disulfide followed by chloroform chlorination gave [TpRh{η2-C2(CO2Me)2}(PPh3)], [TpRh(η2-SCNMe2)(PPh3)]Cl, and [TpRh{:C(SMe)2}Cl2] resp. which were characterized by x-ray crystal structure determination

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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: Potassiumtris(1-pyrazolyl)borohydride(SMILESS: [BH-](N1N=CC=C1)(N2N=CC=C2)N3N=CC=C3.[K+],cas:18583-60-3) is researched.Related Products of 66-71-7. The article 《Stereo- and Regiocontrolled Construction of Trisubstituted Piperidines Using a TpMo(CO)2(Dihydropyridine) Scaffold (Tp = Hydridotrispyrazolylborate)》 in relation to this compound, is published in Journal of Organic Chemistry. Let’s take a look at the latest research on this compound (cas:18583-60-3).

Cationic TpMo(CO)2(dihydropyridine) complexes (Tp = hydridotrispyrazolylborate), readily generated from 3-oxo-3,6-dihydro-2H-pyridine-1-carboxylic acid benzyl ester, represent scaffolds from which (by judicious choice of demetalation conditions) either 2,3,6- or 2,5,6-trisubstituted-1,2,3,6-tetrahydropyridines can be prepared in a regio- and stereodefined way.

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Piperazine – Wikipedia,
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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, Article, Research Support, Non-U.S. Gov’t, Chemistry – A European Journal called Can Non-Kramers TmIII Mononuclear Molecules be Single-Molecule Magnets (SMMs)?, Author is Meng, Yin-Shan; Qiao, Yu-Sen; Zhang, Yi-Quan; Jiang, Shang-Da; Meng, Zhao-Sha; Wang, Bing-Wu; Wang, Zhe-Ming; Gao, Song, which mentions a compound: 18583-60-3, SMILESS is [BH-](N1N=CC=C1)(N2N=CC=C2)N3N=CC=C3.[K+], Molecular C9H10BKN6, Safety of Potassiumtris(1-pyrazolyl)borohydride.

In recent years, plentiful lanthanide-based (TbIII, DyIII, and ErIII) single-mol. magnets (SMMs) were studied, while examples of other lanthanides, for example, TmIII are still unknown. The authors show that by rationally manipulating the coordination sphere, two thulium compounds, 1[(Tp)Tm(COT)] and 2[(Tp*)Tm(COT)] (Tp=hydrotris(1-pyrazolyl)borate; COT=cyclooctatetraenide; Tp*=hydrotris(3,5-dimethyl-1-pyrazolyl)borate), can adopt the structure of non-Kramers SMMs and exhibit their behaviors. Dynamic magnetic studies indicated that both compounds showed slow magnetic relaxation under dc field and a relatively high effective energy barrier (111 K for 1, 46 K for 2). Magnetic diluted 1 a[(Tp)Tm0.05Y0.95(COT)] and 2 a[(Tp*)Tm0.05Y0.95(COT)] even exhibited magnetic relaxation under zero dc field. Relativistic ab initio calculations combined with single-crystal angular-resolved magnetometry measurements revealed the strong easy axis anisotropy and nearly degenerated ground doublet states. The comparison of 1 and 2 highlights the importance of local symmetry for obtaining Tm SMMs.

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Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

HPLC of Formula: 18583-60-3. 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: Potassiumtris(1-pyrazolyl)borohydride, is researched, Molecular C9H10BKN6, CAS is 18583-60-3, about Heterodinuclear Complexes Containing d- and f-block Elements: Synthesis, Structural Characterization, and Metal-Metal Interactions of Novel Chromium(III)-Lanthanide(III) Compounds Bridged by Oxalate. Author is Sanada, Takayuki; Suzuki, Takayoshi; Yoshida, Takafumi; Kaizaki, Sumio.

The reaction of Ln(III) ions with a tripodal ligand HBpz3- (hydrotris(pyrazol-1-yl)borate) and a complex ligand [Cr(acac)2(ox)]- (acac- = acetylacetonate, ox2- = oxalate) in aqueous solution afforded the novel 3d-4f heterodinuclear complexes [(acac)2Cr(ox)Ln(HBpz3)2] (Ln = Eu (1), Gd (2), Tb (3), Yb (4), Lu (5)). 4 Crystallizes in monoclinic space group P2/n, with a 8.594(3), b 18.538(4), c 12.093(2) Å, β 93.71(2)°, and Z = 2. Yb coordinates in an eight-coordinate distorted square antiprismatic geometry. The intramol. Cr···Yb distance is 5.631(1) Å. The magnetic susceptibility data for 2 showed that the CrIII-GdIII interaction is weakly antiferromagnetic with an exchange coupling constant JCrGd = -0.09 cm-1. The luminescence measurements demonstrated the energy transfers for both Ln(III) → Cr(III) and Cr(III) → Ln(III), of which the degree of emission quenching depends on the energy gap of the excited levels in two metal centers. These results reveal that the metal-metal interactions between Cr(III) and Ln(III) are very weak in magnetic interaction but are strong from the viewpoint of energy transfer.

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Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

Computed Properties of C9H10BKN6. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Potassiumtris(1-pyrazolyl)borohydride, is researched, Molecular C9H10BKN6, CAS is 18583-60-3, about Tris(pyrazolyl)borate dihydrogen complexes of ruthenium. Author is Halcrow, Malcolm A.; Chaudret, Bruno; Trofimenko, Swiatoslaw.

Reaction of [Ru(PCy3)2(H2)HI] (Cy = cyclohexyl) with K(tpb) [tpb = tris(pyrazol-1-yl)borate(1-)] or Tl(tdmpb) [tdmpb = tris(3,5-dimethylpyrazol-1-yl)borate(1-)] affords [Ru(η3-L)(PCy3)(H2)H] (L = tpb, tdmpb), via the intermediates trans-[Ru(η2-L)(PCy3)2(H2)H]. Protonation of [Ru(tpb)(PCy3)(H2)H] with HBF4.Et2O leads to [Ru(tbp)(PCy3)(OH2)(H2)]BF4.

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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: Potassiumtris(1-pyrazolyl)borohydride(SMILESS: [BH-](N1N=CC=C1)(N2N=CC=C2)N3N=CC=C3.[K+],cas:18583-60-3) is researched.COA of Formula: C5H10O3. The article 《Solvent-triggered relaxative spin state switching of [Fe(HB(pz)3)2] in a closed nano-confinement of NH2-MIL-101(Al)》 in relation to this compound, is published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices. Let’s take a look at the latest research on this compound (cas:18583-60-3).

The synthesis of the NH2-MIL-101(Al) Metal-Organic Framework (MOF) with bis(hydrotris(pyrazolyl)borato)iron(II), [Fe(HB(pz)3)2], added to the reaction medium yielded [Fe(HB(pz)3)2]@NH2-MIL101(Al) encapsulation products, denoted as S@Ms, in a ‘bottle-around-the-ship’ assembly. [Fe(HB(pz)3)2] is a spin-crossover (SCO) compound with a gradual spin transition at 290-440 K for the bulk material (repeated cycles), associated with a pronounced color change from the red low spin (LS) state to the white high-spin (HS) state. The identity of S@Ms, with a maximum loading of the iron complex at ∼11% (0.16 mols. per Al3OL3 moiety), was confirmed by PXRD and spectroscopic measurements. The entrapped complex, which is stable in air and cannot be removed by vacuum drying, is confined in the cages of the framework. N2 and CO2 gas adsorption measurements on the dry S@M composite with different iron complex loadings confirm the absence of most of the initial NH2-MIL-101(Al) porosity. The S@M composite material demonstrates a gradual thermally induced transition from the red low-spin (LS) state to the light yellow HS state, associated with the color of the matrix, chiefly over the range 300-450 K, which is close to the 290-440 K temperature range for [Fe(HB(pz)3)2]. The thermally induced HS form of S@M does not return to the LS upon cooling to room temperature, and the metastable HS form relaxes only very slowly, which becomes noticeable only after weeks of storage. Rapid and almost complete relaxation and decrease of magnetic moment for up to ∼97% of the whole sweep could be triggered by the addition of n-hexane, as evidenced by the change of color and magnetic measurements. Via mech. stress akin to the action of capillary forces, the adsorbed liquid effectively amplifies the otherwise very weak ‘matrix effect’ by increasing the effective local pressure imposed on the transit mols., thus favoring even further the LS state. The immersion of the dried composites into practically any typical solvents, including MeOH, DMSO, DMF, iPrOH, BuOH, t-BuOH, THF, ethylacetate, CH2Cl2, CHCl3 CCl4, toluene, mesitylene, and cyclohexane, also induces a spin state change, which is evidenced by the change of color. The effect is fully reversible: the metastable HS state could be reinstated upon drying the sample at elevated temperature and subsequent cooling. The materials were thoroughly characterized by AAS, PXRD, gas sorption anal., IR spectroscopy, magnetic measurements, and optical reflectivity measurements. Therefore, a novel MOF-based material with isolated SCO units is proposed, which demonstrates a salient relaxative ‘solvent assisted matrix-effect’ on metastable entrapped sites, potentially suitable for light-driven single-unit addressability.

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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-(Bromomethyl)-4-iodobenzene(SMILESS: IC1=CC=C(CBr)C=C1,cas:16004-15-2) is researched.Related Products of 2343-22-8. The article 《Structure-based Discovery of Phenyl (3-Phenylpyrrolidin-3-yl)sulfones as Selective, Orally Active RORγt Inverse Agonists》 in relation to this compound, is published in ACS Medicinal Chemistry Letters. Let’s take a look at the latest research on this compound (cas:16004-15-2).

A new Ph (3-phenylpyrrolidin-3-yl)sulfone series of RORγt inverse agonists was discovered utilizing the binding conformation of previously reported bicyclic sulfonamide 1. Through a combination of structure-based design and structure-activity relationship studies, a polar set of amides at N1-position of the pyrrolidine ring and perfluoroisopropyl group at para-position of the 3-Ph group were identified as critical structural elements to achieve high selectivity against PXR, LXRα, and LXRβ. Further optimization led to the discovery of (1R,4r)-4-((R)-3-((4-fluorophenyl)sulfonyl)-3-(4-(perfluoropropan-2-yl)phenyl)pyrrolidine-1-carbonyl)cyclohexane-1-carboxylic acid (26), which displayed excellent selectivity, desirable liability and pharmacokinetic properties in vitro, and a good pharmacokinetic profile in mouse. Oral administration of 26 demonstrated dose-dependent inhibition of IL-17 production in a mouse IL-2/IL-23-induced pharmacodynamic model and biol.-like efficacy in an IL-23-induced mouse acanthosis model.

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Piperazine – Wikipedia,
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Tang, Meizhong; Han, Shuxiong; Huang, Shenglan; Huang, Shenlin; Xie, Lan-Gui published the article 《Carbosulfenylation of Alkenes with Organozinc Reagents and Dimethyl(methylthio)sulfonium Trifluoromethanesulfonate》. Keywords: alkene organozinc reagent dimethylmethylthiosulfonium trifluoromethanesulfonate carbosulfenylation; sulfide preparation.They researched the compound: 1-(Bromomethyl)-4-iodobenzene( cas:16004-15-2 ).Reference of 1-(Bromomethyl)-4-iodobenzene. 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:16004-15-2) here.

The electrophilic alkylthiolation of alkenes, initiated by dimethyl(methylthio)sulfonium salts and the subsequent addition of various heteronucleophilies has been well-established. Regarding the use of carbon nucleophiles, however, only carefully designed sp-type carbon sources have been successfully applied. We herein present our findings on the methylthiolation of alkenes with dimethyl(methylthio)sulfonium trifluoromethanesulfonate, followed by carbon-carbon bond formation in the presence of organozinc reagents, thus achieving a catalyst-free protocol toward to the carbosulfenylation of alkenes.

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Piperazine – Wikipedia,
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Category: piperazines. 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: 1-(Bromomethyl)-4-iodobenzene, is researched, Molecular C7H6BrI, CAS is 16004-15-2, about Adsorption and corrosion inhibition behaviour of new theophylline-triazole-based derivatives for steel in acidic medium. Author is Espinoza-Vazquez, Araceli; Rodriguez-Gomez, Francisco Javier; Martinez-Cruz, Ivonne Karina; Angeles-Beltran, Deyanira; Negron-Silva, Guillermo E.; Palomar-Pardave, Manuel; Romero, Leticia Lomas; Perez-Martinez, Diego; Navarrete-Lopez, Alejandra M..

The design and synthesis of a series of theophylline derivatives containing 1,2,3-triazole moieties are presented. The corrosion inhibition activities of these new triazole-theophylline compounds were evaluated by studying the corrosion of API 5 L X52 steel in 1 M HCl medium. The results showed that an increase in the concentration of the theophylline-triazole derivatives also increases the charge transference resistance (Rct) value, enhancing inhibition efficiency and decreasing the corrosion process. The electrochem. impedance spectroscopy under static conditions studies revealed that the best inhibition efficiencies (approx. 90%) at 50 ppm are presented by the all-substituted compounds According to the Langmuir isotherm, the compounds 4 and 5 analyzed exhibit physisorption-chemisorption process, with exception of the hydrogen 3, bromo 6 and iodo 7 substituted compounds, which exhibit chemisorption process. The corrosion when submerging a steel bar in 1 M HCl was studied using SEM-EDS. This experiment showed that the corrosion process decreases considerably in the presence of 50 ppm of the organic inhibitors.

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Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics