Category: catalyst-ligand

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 Experimental and Computational Investigations of the Reactions between α,β-Unsaturated Lactones and 1,3-Dienes by Cooperative Lewis Acid/Broensted Acid Catalysis, published in 2020-10-05, which mentions a compound: 3393-45-1, Name is 5,6-Dihydro-2H-pyran-2-one, Molecular C5H6O2, SDS of cas: 3393-45-1.

The reactions of α,β-unsaturated δ-lactones with activated dienes such as 1,3-dimethoxy-1-[(trimethylsilyl)oxy]-1,3-butadiene (Brassard’s diene) are barely known in literature and show high potential for the synthesis of isocoumarin moieties. An in-depth investigation of this reaction proved a stepwise mechanism via the vinylogous Michael-products. Subsequent cyclization and oxidation by LHMDS and DDQ, resp., provided six mellein derivatives (30-84%) and four angelicoin derivatives (40-78%) over three steps. DFT-calculations provide insights into the reaction mechanism and support the theory of a stepwise reaction.

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Product Details of 89972-77-0. 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: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Functional polycationic and neutral starburst dendrimers with silsesquioxane cores.

Starburst dendrimers featuring iodo- or phosphonate- silsesquioxane cores and terpyridyl end groups were prepared The terpyridyl terminal groups allow for future incorporation of transition metal centers. Silsesquioxane-based starburst dendrimers with mol. weights from 3332 to 15985 g/mol were prepared The monodendrons and silsesquioxane-based dendrimers were studied using a combination of NMR, ESI/MS, FAB/MS, MALDI-TOF/MS, and GPC.

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Metal catalyst and ligand design,
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Romain, Sophie; Duboc, Carole; Neese, Frank; Riviere, Eric; Hanton, Lyall R.; Blackman, Allan G.; Philouze, Christian; Lepretre, Jean-Claude; Deronzier, Alain; Collomb, Marie-Noelle published the article 《An unusual stable mononuclear MnIII bis-terpyridine complex exhibiting Jahn-Teller compression: electrochemical synthesis, physical characterisation and theoretical study》. Keywords: trivalent manganese tolylterpyridine complex electrooxidative preparation Jahn Teller compression; crystal structure manganese tolylterpyridine complex; zero field splitting manganese tolylterpyridine complex.They researched the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0 ).Category: catalyst-ligand. 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:89972-77-0) here.

The mononuclear Mn bis-terpyridine complex [Mn(tolyl-terpy)2](X)3 (1(X)3; X = BF4, ClO4, PF6; tolyl-terpy = 4′-(4-methylphenyl)-2,2′:6′,2”-terpyridine), containing Mn in the unusual +III oxidation state, was isolated and characterized. The 13+ ion is a rare example of a mononuclear MnIII complex stabilized solely by neutral N ligands. Complex 13+ is obtained by electrochem. oxidation of the corresponding MnII compound 12+ in anhydrous MeCN. Under these conditions the cyclic voltammogram of 12+ exhibits not only the known MnII/MnIII oxidation at E1/2 = +0.91 V vs. Ag/Ag+ (+1.21 V vs. SCE) but also a 2nd metal-based oxidation process corresponding to MnIII/MnIV at E1/2 = +1.63 V (+1.93 V vs. SCE). Single crystals of 1(PF6)3·2MeCN were obtained by an electrocrystn. procedure. X-ray anal. unambiguously revealed its tetragonally compressed octahedral geometry and high-spin character. The electronic properties of 13+ were studied in detail by magnetic measurements and theor. calculations, from which a D value of +4.82 cm-1 was precisely determined D. functional and complete active space SCF ab initio calculations both correctly predict a pos. sign of D, in agreement with the compressed tetragonal distortion observed in the x-ray structure of 1(PF6)3·2MeCN. The different contributions to D were calculated, and (1) the spin-orbit coupling part (+2.593 cm-1) is predominant compared to the spin-spin interaction (+1.075 cm-1) and (2) the excited triplet states make the dominant contribution to the total D value.

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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 Magnetic properties of new layered compounds LaM1/3Sb5/3O6, M = Co, Ni, and Cu, with a honeycomb structure, published in 2021-12-31, which mentions a compound: 12069-69-1, mainly applied to lanthanum cobalt antimony oxide layered compound magnetic property, Computed Properties of CH2Cu2O5.

New compounds with the rosiaite type structure LaM1/3Sb5/3O6, M = Co, Ni, and Cu, were synthesized. The compounds belong to quasi-two-dimensional magnets, in which magnetic interactions occur in the layers with a honeycomb structure. It is shown that there is no long-range magnetic order in these compounds The temperature and field dependences of the magnetization in the compounds with M = Co, Ni indicate the presence of short-range anti-ferromagnetic and ferromagnetic exchange interactions. In the LaM1/3Sb5/3O6, M = Co, Ni, compounds, the interactions occur between Co2+ or Ni2+ ions of isolated magnetic clusters randomly distributed in the paramagnetic matrix in the chains of (M/Sb)O6 octahedrons. These clusters have sizes comparable with the crystal cell size. The LaCu1/3Sb5/3O6 compound is paramagnetic.

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Metal catalyst and ligand design,
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Safety of Basic copper carbonate. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Basic copper carbonate, is researched, Molecular CH2Cu2O5, CAS is 12069-69-1, about A catalytic approach of blending CO2-activating MOF struts for cycloaddition reaction in a helically interlaced Cu(II) amino acid imidazolate framework: DFT-corroborated investigation. Author is Kathalikkattil, Amal Cherian; Gu, Yunjang; Kurisingal, Jintu F.; Lee, Hankyul; Kim, Hyungjun; Choe, Youngson; Park, Dae-Won.

In CO2 transformation catalysis, the synthesis of cyclic carbonates using two classes of MOF catalysts viz., zeolitic imidazolate frameworks (ZIF) and MOFs with carboxylate-capped SBUs have gained large attention. Herein the authors propose the strategy of employing a unified multifunctional framework formed in the metal-centered assembly of imidazole and amino-carboxylates for CO2 transformation, such as propylene carbonate (PC) by the cycloaddition of CO2 with propylene oxide. The framework {[Cu(L-asp)(1,4-bix)0.5]·3H2O}n (CuAspBix) comprises of the amino acid building units, L-aspartic acid (L-Asp) and the flexible ligand, 1,4-bis(imidazole-1-ylmethyl)benzene [1,4-Bix]. The 1,4-Bix ligand with imidazole terminals renders elongated M-M distances and flexibility in comparison with pristine ZIF materials. The cumbersome synthesis procedure yielding poor phase purity of the bulk catalyst in solvothermal conditions were improved by a microwave-assisted synthesis, preserving the structural and physicochem. properties. Minimal energy input or room temperatures for the catalysis occurred via the synergistic participation of CuAspBix and quaternary ammonium bromide salt, demonstrated by d.-functional theory computational studies to propose mechanistic pathway of the reaction. Reaction conditions were optimized by altering the parameters. The heterogeneous catalyst was reused four times without a significant change in activity.

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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: 494-52-0, is researched, SMILESS is C1(C=NC=CC=1)[C@@H]1CCCCN1, Molecular C10H14N2Journal, Russian Journal of General Chemistry called Synthesis, Structure, and Biological Activity of Cinnamoyl-Containing Cytisine and Anabasine Alkaloids Derivatives, Author is Nurkenov, O. A.; Nurmaganbetov, Zh. S.; Seilkhanov, T. M.; Fazylov, S. D.; Satpayeva, Zh. B.; Turdybekov, K. M.; Talipov, S. A.; Seydakhmetova, R. B., the main research direction is cytisine cinnamoyl derivative preparation antibacterial antifungal cytotoxic activity; anabasine cinnamoyl derivative preparation antibacterial antifungal activity cytotoxic.Application In Synthesis of (S)-3-(Piperidin-2-yl)pyridine.

The reactions of the cytisine and anabasine alkaloids with cinnamic acid chloride have been studied, and hydrazinolysis of the resulting N-cinnamoylcytisine and N-cinnamoylanabazine has been carried out. The reaction of cinnamoyl isothiocyanate with alkaloids has afforded the corresponding thiourea derivatives Antimicrobial and cytotoxic activity of cinnamoyl-containing derivatives of these alkaloids has been evaluated.

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Metal catalyst and ligand design,
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SDS of cas: 89972-77-0. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Synthesis, crystal structure and thermal properties of Cd(II) and Hg(II) terpyridine based compounds. Author is Saghatforoush, Lotfali; Pourmohsen, Mehrdad; Asgari, Parvin.

Cd(II) and Hg(II) compounds of 4′-(4-methylphenyl)-2,2′:6′,2”-terpyridine (Mephtpy), [Cd(Mephtpy)I2] and [Hg(Mephtpy)I2], were synthesized and characterized by CHN elemental anal., FTIR, 1H and 13C NMR, thermal anal. and analyzed structurally by x-ray single-crystal diffraction. X-ray anal. showed that the coordination number in the complexes were the same with an N3I2 coordination sphere. Both metal ions adopt a distorted square-pyramidal geometry. The thermogravimetric analyses showed that the complexes were stable up to 365 and 340°, resp.

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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.Farran, Rajaa; Le-Quang, Long; Mouesca, Jean-Marie; Maurel, Vincent; Jouvenot, Damien; Loiseau, Frederique; Deronzier, Alain; Chauvin, Jerome researched the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0 ).Application of 89972-77-0.They published the article 《[Cr(ttpy)2]3+ as a multi-electron reservoir for photoinduced charge accumulation》 about this compound( cas:89972-77-0 ) in Dalton Transactions. Keywords: chromium ruthenium polypyridyl photoinduced electron transfer. We’ll tell you more about this compound (cas:89972-77-0).

[Cr(ttpy)2]3+ (ttpy = 4′-(4-methylphenyl)-2,2′:6,2′′-terpyridine) exhibits rich electrochem. and photophys. properties. Cyclic voltammetry performed in CH3CN shows in the cathodic part the presence of three one-electron reversible systems at -0.47, -0.85 and -1.35 V vs. Ag/AgNO3 10-2 M. These systems are attributed to the reduction of the terpyridine ligands with a partial delocalization of the charge on the tolyl for the last reduction event. The three different reduced species were generated by exhaustive electrolysis and characterized by EPR and UV-visible spectroscopy; DFT calculations were performed to locate the spin d. of the electrons added during the reduction Visible light irradiation of [Cr(ttpy)2]3+ induces the population of a luminescent metal-centered excited state with a lifetime of 270 ns in deoxygenated CH3CN. This excited state can be quenched by an electron transfer process with triphenylphosphine (PPh3) or triethanolamine (TEOA). Using TEOA as a sacrificial electron donor, the doubly reduced species (i.e.[Cr(ttpy)2] +) can be generated under continuous irradiation In the presence of [Ru(bpy)3]2+ as an addnl. photosensitizer, the photoreduction of [Cr(ttpy)2]3+ towards [Cr(ttpy)2]+ is accelerated. The trinuclear [{RuII(bpy)2(bpy-O-tpy)}2CrIII]7+ complex ([Ru2Cr]7+) in which a CrIII-bis-terpyridine center is covalently linked to two RuII-tris-bipyridine moieties by oxo bridges has been synthesized. Its electrochem., photophys. and photochem. properties were investigated in deoxygenated CH3CN. Cyclic voltammetry indicates only a poor electronic communication between the different subunits, whereas luminescence experiments show a strong quenching of the RuII* excited state by an intramol. process. Continuous irradiation of [Ru2Cr]7+ under visible conditions in the presence of TEOA leads to [Ru2Cr]4+ where three electrons are stored on the [Cr(ttpy)] subunit.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: (S)-3-(Piperidin-2-yl)pyridine, is researched, Molecular C10H14N2, CAS is 494-52-0, about Comprehensive genome-wide identification, characterization, and expression profiling of MATE gene family in Nicotiana tabacum, the main research direction is Nicotiana MATE transporter family expression profiling; Co-expression; Gene expression; MATE transporters; Nicotiana tabacum.Computed Properties of C10H14N2.

The transporters belonging to the MATE family are involved in the transportation of diverse ligands, including metal ions and small organic mols., and, therefore, play an important role in plant biol. Our genome-wide anal. led to the identification of 138 MATE genes in N. tabacum, which were grouped into four major phylogenetic clades. The expression of several NtMATE genes was reported to be differential in different tissues, namely young leaf, mature leaf, stem, root, and mature flower. The upstream regions of the NtMATE genes were predicted to contain several cis-acting elements associated with hormonal, developmental, and stress responses. Some of the genes were found to display induced expression following Me jasmonate treatment. The co-expression anal. revealed 126 candidate transcription factor genes that might be involved in the transcriptional regulation of 21 NtMATE genes. Certain MATE genes (NtMATE81, NtMATE82, NtMATE88, and NtMATE89) were predicted to be targeted by micro RNAs (nta-miR167a, nta-miR167b, nta-miR167c, nta-miR167d and nta-miR167e). The computational anal. of MATE transporters provided insights into the key amino acid residues involved in the binding of the alkaloids. Further, the putative function of some of the NtMATE transporters was also revealed. The present study develops a solid foundation for the functional characterization of MATE transporter genes in N. tabacum.

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Metal catalyst and ligand design,
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HPLC of Formula: 89972-77-0. 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: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Surmounting tumor resistance to metallodrugs by co-loading a metal complex and siRNA in nanoparticles. Author is Qiao, Hongzhi; Zhang, Lei; Fang, Dong; Zhu, Zhenzhu; He, Weijiang; Hu, Lihong; Di, Liuqing; Guo, Zijian; Wang, Xiaoyong.

Copper complexes are promising anticancer agents widely studied to overcome tumor resistance to metal-based anticancer drugs. Nevertheless, copper complexes per se encounter drug resistance from time to time. Adenosine-5′-triphosphate (ATP)-responsive nanoparticles containing a copper complex CTND and B-cell lymphoma 2 (Bcl-2) small interfering RNA (siRNA) were constructed to cope with the resistance of cancer cells to the complex. CTND and siRNA can be released from the nanoparticles in cancer cells upon reacting with intracellular ATP. The resistance of B16F10 melanoma cells to CTND was terminated by silencing the cellular Bcl-2 gene via RNA interference, and the therapeutic efficacy was significantly enhanced. The nanoparticles triggered a cellular autophagy that amplified the apoptotic signals, thus revealing a novel mechanism for antagonizing the resistance of copper complexes. In view of the extensive association of Bcl-2 protein with cancer resistance to chemotherapeutics, this strategy may be universally applicable for overcoming the ubiquitous drug resistance to metallodrugs.

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Metal catalyst and ligand design,
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