Category: catalyst-ligand

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: 32780-06-6, is researched, Molecular C5H8O3, about New synthesis of (S)-5-(hydroxymethyl)-2(5H)-furanone, a multipurpose synthon, the main research direction is furanone hydroxymethyl chiral synthon; synthon chiral hydroxymethylfuranone; isopropylideneglyceraldehyde condensation tertiarybutyl lithioacetate; absolute configuration hydroxyhydroxymethyltetrahydrofuranone silylated.Synthetic Route of C5H8O3.

The title compound I, a versatile chiral synthon and its tert-butyldimethylsilyloxy ether were prepared from isopropylideneglyceraldehyde II in 5 and 4 steps, resp., via 2-deoxy-D-ribolactone intermediates.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Reference of 4-(p-Tolyl)-2,2:6,2-terpyridine. 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 Mitochondrial Dynamics Tracking with Two-Photon Phosphorescent Terpyridyl Iridium(III) Complexes. Author is Huang, Huaiyi; Zhang, Pingyu; Qiu, Kangqiang; Huang, Juanjuan; Chen, Yu; Ji, Liangnian; Chao, Hui.

Mitochondrial dynamics, including fission and fusion, control the morphol. and function of mitochondria, and disruption of mitochondrial dynamics leads to Parkinson′s disease, Alzheimer′s disease, metabolic diseases, and cancers. Currently, many types of com. mitochondria probes are available, but high excitation energy and low photo-stability render them unsuitable for tracking mitochondrial dynamics in living cells. Therefore, mitochondrial targeting agents that exhibit superior anti-photo-bleaching ability, deep tissue penetration and intrinsically high three-dimensional resolutions are urgently needed. Two-photon-excited compounds that use low-energy near-IR excitation lasers have emerged as non-invasive tools for cell imaging. In this work, terpyridyl cyclometalated Ir(III) complexes (Ir1-Ir3) are demonstrated as one- and two-photon phosphorescent probes for real-time imaging and tracking of mitochondrial morphol. changes in living cells.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 32780-06-6. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, is researched, Molecular C5H8O3, CAS is 32780-06-6, about Synthesis of new optically active bis- and tris(phosphines). Author is Brunner, Henri; Lautenschlager, Hans Juergen.

The synthesis of new optically active alkanediylbis- e.g.; Ph2PCH2CH2CH(PPh2)CH2PPh2 and alkanetriyltris(diphenylphosphines) e.g., Ph2P(CH2)3CH(PPh2)CH2OMe is described. Easily accessible optically pure lactones and carboxylic acids are reduced to the alcs., tosylated and reacted with LiPPh2 to give the corresponding phosphines.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Application In Synthesis of (S)-3-(Piperidin-2-yl)pyridine. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: (S)-3-(Piperidin-2-yl)pyridine, is researched, Molecular C10H14N2, CAS is 494-52-0, about A pharmacological comparison of two isomeric nicotinic receptor agonists: the marine toxin isoanatabine and the tobacco alkaloid anatabine. Author is Xing, Hong; Keshwah, Sunil; Rouchaud, Anne; Kem, William R..

Many organisms possess “”secondary”” compounds to avoid consumption or to immobilize prey. While the most abundant or active compounds are initially investigated, more extensive analyses reveal other “”minor”” compounds with distinctive properties that may also be of biomedical and pharmaceutical significance. Here, we present an initial in vitro investigation of the actions of two isomeric tetrahydropyridyl ring-containing anabasine analogs: isoanatabine, an alkaloid isolated from a marine worm, and anatabine, a relatively abundant minor alkaloid in com. tobacco plants. Both compounds have a double bond that is distal to the piperidine ring nitrogen of anabasine. Racemic isoanatabine and anatabine were synthesized and their S- and R-enantiomers were isolated by chiral high pressure liquid chromatog. (HPLC). Both isoanatabines displayed higher efficacies at α4β2 nicotinic acetylcholine receptors (nAChRs) relative to the anatabines; R-isoanatabine was most potent. Radioligand binding experiments revealed similar α4β2 nAChR binding affinities for the isoanatabines, but R-anatabine affinity was twice that of S-anatabine. While the two anatabines and S-isoanatabine were highly efficacious agonists at α7 nAChRs, R-isoanatabine was only a weak partial agonist. The four compounds share an ability to stimulate both α4β2 and α7 nAChRs, a property that may be useful in developing more efficacious drugs to treat neurodegenerative and other medical disorders.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

HPLC of Formula: 2834-05-1. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 11-Bromoundecanoic acid, is researched, Molecular C11H21BrO2, CAS is 2834-05-1, about Distinct twist-bend nematic phase behaviors associated with the ester-linkage direction of thioether-linked liquid crystal dimers. Author is Arakawa, Yuki; Komatsu, Kenta; Feng, Jun; Zhu, Chenhui; Tsuji, Hideto.

The twist-bend nematic phase (NTB) is a new spontaneous symmetry-breaking phenomenon observed in fluidic liquid crystal (LC) phases, which possesses a heliconical structure with a pitch ranging from several to tens of nanometers. Herein we demonstrate the distinct nano-to-macroscopic NTB phase behaviors associated with the ester-bond direction in two homologous series of sulfur-containing cyanobiphenyl-based LC dimers, viz. CBCOOnSCB and CBOCOnSCB (n = 2, 4, 6, 8, and 10). Both the series (excluding n = 2) formed NTB phases in which the homologues (n = 4 and 6) exhibited the NTB phases across a broad temperature range, which were observed to be stable even at room temperature and eventually formed NTB glasses. We found that both homologues (n = 4 and 6) displayed distinct phase-transition properties and optical textures with respect to the NTB phases. By performing tender resonant X-ray scattering measurements at the sulfur K-edge, we discovered their distinctly different nanoscopic helical pitch lengths. Within a similar shifted temperature, the pitches for CBOCOnSCB showed strong temperature dependence and were approx. double those of CBCOOnSCB, which exhibited significantly weaker temperature dependence. Compared to those of the representative twist-bend nematogenic dimers, the pitches of CBOCOnSCB and CBCOOnSCB are longer and shorter, resp. It is assumed that the mol. bend (or the mol. biaxiality) of LC dimers strongly influences the precession angle of the heliconical helix, and hence the resulting pitch. These findings provide new insights into the mol. designs to modulate the nanoscale helical pitches of the NTB phases.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Towards ordered architectures: self-assembly and stepwise procedures to the hexameric metallomacrocycles [arylbis(terpyridinyl)6FeII6-n-RuIIn] (n = 0, 2, 3, 5), the main research direction is iron ruthenium arylbisterpyridinyl hexameric heterometallomacrocycle preparation self assembly electrochem.Formula: C22H17N3.

Hexameric metallomacrocycles [arylbis(terpyridinyl)6FeII6-n-RuIIn] (n = 0, 2, 3, 5) are a new class of ordered rigid-macromols. which possess unique structural, electronic, and phys. characteristics. Directed- and self-assembly methods for the construction of these stable bis(terpyridine)-based materials were studied by using both FeII and RuII as the coordinating metals. These heterometallomacrocycles and their homocounterparts are structurally compared, and their attendant electrochem. properties are analyzed and evaluated. These studies demonstrate the potential to create stable, nanoscale, doughnut-shaped, mol. assemblies with envisioned ramifications for energy storage and release, as well as nanoscale mol. electronic and magnetic devices.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: (S)-3-(Piperidin-2-yl)pyridine( cas:494-52-0 ) is researched.Quality Control of (S)-3-(Piperidin-2-yl)pyridine.Scharenberg, Friederike; Stegemann, Thomas; Cicek, Serhat Sezai; Zidorn, Christian published the article 《Sequestration of pyridine alkaloids anabasine and nicotine from Nicotiana (Solanaceae) by Orobanche ramosa (Orobanchaceae)》 about this compound( cas:494-52-0 ) in Biochemical Systematics and Ecology. Keywords: Orobanche Nicotiana anabasine nicotine anatabine nornicotine root Germany. Let’s learn more about this compound (cas:494-52-0).

Plants of the root holoparasite Orobanche ramosa L. and four of its potential host species, Nicotiana glauca Graham, Nicotiana rustica L., Nicotiana sylvestris Speg. & S.Comes, and Nicotiana tabacum L., grown in the greenhouse in Kiel/Germany, were analyzed for their contents of pyridine alkaloids anabasine (1) and nicotine (2). All investigated samples contained both alkaloids in different amounts The distribution of the alkaloids in the various plant organs of Nicotiana differed significantly between the species. The alkaloid contents of the Orobanche samples relative to the alkaloid contents of the roots of the resp. host plants varied between 3.47 ± 1.08 and 28.8 ± 37.5%. Orobanche plants drain water and crucial nutrients from their hosts; also, some examples for the sequestration of specialized natural products have been reported. O. ramosa is not able to synthesize pyridine alkaloids anabasine (1) and nicotine (2) itself; therefore, the present study proves the sequestration of pyridine alkaloids by O. ramosa from the four investigated Nicotiana host species.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Computed Properties of C22H17N3. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Synthesis and Characterization of Two Copper (II) Complexes of 4′-tolyl-2,2′:6′,2”-Terpyridine and Simultaneous Detection and Separation of [Cu(ttpy)(NO3)2] and CuO by Capillary Zone Electrophoresis Method. Author is Saghatforoush, Lotf Ali; Sahin, Ertan; Mehdizadeh, Robabeh; Hasanzadeh, Mohammad; Sanati, Soheila; Musevi, Seyed Javad.

A simple synthetic method has been used to prepare copper(II) complexes of 4′-tolyl-2,2′:6′,2”-terpyridine (ttpy) ligand, [Cu(ttpy)(NO3)2] (1) and [Cu2(ttpy)(ClO4)4]n (2), in good yields. Also capillary zone electrophoresis (CZE) method was used for simultaneous detection and separation of complex 1 and CuO obtained from its calcination.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about New starburst metallodendrimers based on octa(diphenylphosphino)-functionalized silsesquioxane cores.Reference of 4-(p-Tolyl)-2,2:6,2-terpyridine.

Surface-modified starburst dendrimers were prepared by reaction of terpyridine-functionalized polyether monodendrons with an oligomeric polyhedral silsesquioxane (POSS) core. Subsequent reaction of these starburst dendrimers with ruthenium (II)-based precursors affords starburst metallodendrimers. These new dendrimers were characterized using a combination of mass spectral (MALDI-TOF, ESI, and FAB/MS) and NMR (1H, 13C, and 31P{1H}) analyses. Other characterization methods include photophys. (absorption, emission, excited-state lifetime, and quantum yield) and electrochem. (cyclic and square wave voltammetric) analyses. Photophys. data indicate that there is no intramol. excited-state quenching even in the generation 3 metallodendrimer, which possesses 32 ruthenium (II) centers. Electrochem. studies reveal the presence of charge trapping effects, as well as ligand-centered and metal-centered redox couples.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Computed Properties of C10H14N2. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: (S)-3-(Piperidin-2-yl)pyridine, is researched, Molecular C10H14N2, CAS is 494-52-0, about Gas chromatography-mass spectrometry method for simultaneous detection of nine alkaloids in tobacco and tobacco products by QuEChERS sample preparation. Author is Li, Xintong; Liu, Fang; Wang, Huifang; He, Fan; Yang, Rui; Zhao, Mingqin.

One method based on QuEChERS sample preparation is presented in this study, which leads to simultaneously detect nine alkaloids in tobacco and tobacco products. Nicotine, nomicotine, myosmine, N-Me anabasine, β-nicotyrine, anabasine, anatabine, isonicotenine and cotinine can all be found in fresh tobacco leaves, cigars, Virginia-type and blended-type cigarettes. The samples were purified via a certain proportion of adsorbents consisting of anhydrous magnesium sulfate, PSA and carbon after extracting, then centrifuged and filtered before analyzing by GC-MS. The matrix effects were all among 88 – 105%. The limit of detection of all were within the range of 0.0065 – 0.1509 μg/g and limit of quantification were among 0.0217 – 0.5031 μg/g. The recovery rates were higher than 89%. This is the first time that the QuEChERS sample preparation method has been applied for tobacco alkaloids, where more varieties of alkaloids could be quantified regarding sensitivity and reproducibility.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI