Day: November 2, 2022

Li, Zi-Qi; Fu, Yue; Deng, Ruohan; Tran, Van T.; Gao, Yang; Liu, Peng; Engle, Keary M. published an article in 2020, the title of the article was Ligand-controlled regiodivergence in nickel-catalyzed hydroarylation and hydroalkenylation of alkenyl carboxylic acids.Safety of 2-(4,5-Dihydro-4,4-dimethyl-2-oxazolyl)pyridine And the article contains the following content:

A nickel-catalyzed regiodivergent hydroarylation and hydroalkenylation of unactivated alkenyl carboxylic acids is reported, whereby the ligand environment around the metal center dictates the regiochem. outcome. Markovnikov hydrofunctionalization products are obtained under mild ligand-free conditions, with up to 99% yield and >20:1 selectivity. Alternatively, anti-Markovnikov products can be accessed with a novel 4,4-disubstituted Pyrox ligand I in excellent yield and >20:1 selectivity. Both electronic and steric effects on the ligand contribute to the high yield and selectivity. Mechanistic studies suggest a change in the turnover-limiting and selectivity-determining step induced by the optimal ligand. DFT calculations reveal that in the anti-Markovnikov pathway, repulsion between the ligand and the alkyl group is minimized (by virtue of it being 1° vs. 2°) in the rate- and regioselectivity-determining transmetalation transition state. The experimental process involved the reaction of 2-(4,5-Dihydro-4,4-dimethyl-2-oxazolyl)pyridine(cas: 109660-12-0).Safety of 2-(4,5-Dihydro-4,4-dimethyl-2-oxazolyl)pyridine

The Article related to hydroarylation regiodivergent alkenyl carboxylic acid boronic acid nickel catalyst, hydroalkenylation regiodivergent alkenyl carboxylic acid boronic acid nickel catalyst, Benzene, Its Derivatives, and Condensed Benzenoid Compounds: Carboxylic Acids and Peroxycarboxylic Acids and Their Sulfur-Containing Analogs and Salts and other aspects.Safety of 2-(4,5-Dihydro-4,4-dimethyl-2-oxazolyl)pyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On February 15, 1987, Kamogawa, Hiroyoshi; Suzuki, Tsuyoshi published an article.Category: pyridine-derivatives The title of the article was Photochromism of viologen crystals. And the article contained the following:

Some viologen crystals bearing a p-toluenesulfonate anion as a counter ion exhibit reversible photoreductions (photochromism) either in air or in vacuum. In a poly(N-vinyl-2-pyrrolidone) matrix all investigated viologens indicated reversible photocolor developments. Amphoteric ions such as 1,1′-bis(3-sulfonatoporpyl)-4,4′-bipyridinium also developed colors with high stabilities. The experimental process involved the reaction of 1,1′-Dipropyl-[4,4′-bipyridine]-1,1′-diium bromide(cas: 52243-87-5).Category: pyridine-derivatives

The Article related to photochromism viologen crystal toluenesulfonate counterion, Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes: Photochromic, Thermochromic, and Electrochromic Imaging Systems and other aspects.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Mortimer, Roger J.; Dillingham, Joanne L. published an article in 1997, the title of the article was Electrochromic 1,1′-dialkyl-4,4′-bipyridinium-incorporated Nafion electrodes.Application of 52243-87-5 And the article contains the following content:

The sym. 1,1′-dialkyl-4,4′-bipyridynium salts (alkyl = Me, Et, Pr, Bu, n-pentyl, n-hexyl) can be electrostatically incorporated into Nafion films to produce electrochromic electrodes. A trend from purple to pink in the color of the radical-cation redox state is observed This has been interpreted by in situ visible absorption spectroelectrochem. measurements as being due to a higher incidence of radical-cation dimers in the Nafion films with increase in alkyl chain length. Response times for coloration are shorter than for bleaching, owing to the slower phys. diffusion of the radical-cation dimers. The 1,1′-di-n-heptyl-4,4′-bipyridinium system was not incorporated into the Nafion structure and impede extensive incorporation into the bulk of the anionic polyelectrolyte. The presence of an inner Prussian blue layer in a Prussian blue/Nafion (1,1′-dialkyl-4,4′-bipyridinium) bilayer configuration permits five-color polyelectrochromicity at a single electrode. The experimental process involved the reaction of 1,1′-Dipropyl-[4,4′-bipyridine]-1,1′-diium bromide(cas: 52243-87-5).Application of 52243-87-5

The Article related to nafion alkylbipyridinum salt electrochromic electrode, electrochromism nafion incorporated alkylbipyridinum salt, Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes: Photochromic, Thermochromic, and Electrochromic Imaging Systems and other aspects.Application of 52243-87-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On February 28, 1997, Kim, Sung Hoon; Bae, Jin Seok; Hwang, Seok Hwan; Gwon, Tae Sun; Doh, Myung Ki published an article.Electric Literature of 52243-87-5 The title of the article was Dimer formation of viologen derivatives and their electrochromic properties. And the article contained the following:

The electrochromic properties of 1,1′-diethyl-4,4′-bipyridinium dibromide (EV), 1,1′-dipropyl-4,4′-bipyridinium dibromide (PV), 1,1′-dibutyl-4,4′-bipyridinium dibromide (BV) and 1-ethyl-1′-Bu bipyridinium dibromide (EBV) were studied using a propylene-carbonate/methanol solution with Bu4NBF4 as the supporting electrolyte. A monomer-dimer equilibrium is proposed to explain the observation that the EV and EBV cation radical solutions are violet at an applied voltage of 1.7-3.0 V, but become blue in the open-circuit condition. The experimental process involved the reaction of 1,1′-Dipropyl-[4,4′-bipyridine]-1,1′-diium bromide(cas: 52243-87-5).Electric Literature of 52243-87-5

The Article related to electrochromism viologen derivative monomer dimer equilibrium, viologen derivative cation radical electrochromic cell, Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes: Photochromic, Thermochromic, and Electrochromic Imaging Systems and other aspects.Electric Literature of 52243-87-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On September 25, 2014, Schwiebert, Erik; Streiff, John; Dixon, John; Gao, Hongwu published a patent.Computed Properties of 25813-24-5 The title of the patent was Coumarin derivatives and methods of use in treating cystic fibrosis, chronic obstructive pulmonary disease, and misfolded protein disorders. And the patent contained the following:

The invention relates to coumarin derivatives of formula I or pharmaceutically acceptable salts or prodrugs thereof as novel CFTR corrector compounds that are effective in rescuing halide efflux, delF508-CFTR protein processing, and apical functional chloride ion transport in a cell are provided. Coumarin derivatives of formula I or pharmaceutically acceptable salts or prodrugs thereof, wherein R1, R2, R3, R4, X, and Y are as defined in the disclosure, are claimed. Example compounds such as II were prepared by multistep synthesis and evaluated in vitro and in vivo for their activity as CFTR correctors (data shown). Also provided are methods for treating protein folding disorders (e.g., cystic fibrosis and chronic obstructive pulmonary diseases). The methods include administering a CFTR corrector compound or pharmaceutically acceptable salt or prodrug thereof. Methods of rescuing halide efflux in a cell, correcting a processing defect of a delF508-CFTR protein in a cell, and correcting functional delF508-CFTR chloride channels in a cell are also provided. The experimental process involved the reaction of 3,5-Dibromo-4-methoxypyridine(cas: 25813-24-5).Computed Properties of 25813-24-5

The Article related to coumarin preparation cftr corrector chronic obstructive pulmonary disease treatment, Heterocyclic Compounds (One Hetero Atom): Benzopyrans (Including Coumarins, Isocoumarins, Chromones, Benzopyrones, Dibenzopyrans, and Other Arenopyrans) and other aspects.Computed Properties of 25813-24-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On August 31, 2007, Varghese, Hema Tresa; Panicker, C. Yohannan; Anto, P. L.; Philip, Daizy published an article.Category: pyridine-derivatives The title of the article was Vibrational spectroscopic studies and ab initio calculations of pyridine-3-sulfonic acid. And the article contained the following:

FT-Raman and FT-IR spectra of pyridine-3-sulfonic acid were recorded and analyzed. The mol. geometry and vibrational wave numbers of pyridine-3-sulfonic acid have been calculated using the Hartree-Fock method with different basis sets. Comparison of the observed fundamental vibrational wavenumbers of pyridine-3-sulfonic acid with calculated results by Hartree-Fock method is found in agreement with the exptl. data. The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Category: pyridine-derivatives

The Article related to pyridinesulfonic acid vibrational spectroscopy ab initio, Physical Organic Chemistry: Absorption, Emission, Reflection, and Scattering Spectra (Ultraviolet and Visible, Infrared and Fourier Transform Infrared, Raman, Microwave, Photoelectron, Fluorescence, Phosphorescence, etc.) and other aspects.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lai, Thanh-Loan; Pop, Flavia; Melan, Caroline; Canevet, David; Salle, Marc; Avarvari, Narcis published an article in 2016, the title of the article was Triggering Gel Formation and Luminescence through Donor-Acceptor Interactions in a C3-Symmetric Tris(pyrene) System.Computed Properties of 75449-26-2 And the article contains the following content:

Straightforward modulation of the gelation, absorption and luminescent properties of a tris(pyrene) organogelator containing a C3-sym. benzene-1,3,5-tricarboxamide central unit functionalized by three 3,3′-diamino-2,2′-bipyridine fragments is achieved through donor-acceptor interactions in the presence of tetracyanoquinodimethane. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Computed Properties of 75449-26-2

The Article related to organogelator gelation uvvis luminescence tcnq donor acceptor, c3 symmetry, donor-acceptor systems, luminescence, organogels, pyrene, Physical Organic Chemistry: Absorption, Emission, Reflection, and Scattering Spectra (Ultraviolet and Visible, Infrared and Fourier Transform Infrared, Raman, Microwave, Photoelectron, Fluorescence, Phosphorescence, etc.) and other aspects.Computed Properties of 75449-26-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Turnbull, William L.; Luyt, Leonard G. published an article in 2018, the title of the article was Amino-Substituted 2,2′-Bipyridine Ligands as Fluorescent Indicators for ZnII and Applications for Fluorescence Imaging of Prostate Cells.Recommanded Product: 75449-26-2 And the article contains the following content:

ZnII concentrations in malignant prostate tissues are much lower than in benign or healthy, suggesting that ZnII levels are a potential biomarker for prostate cancer (PCa). Five 2,2′-bipyridine ligands were synthesized containing amino substituents with varying electron-donating ability for study as fluorescent ZnII indicators. The excited state characteristics of the ligands were explored by UV/visible and fluorescence spectroscopy. 3,3′-Diamino-2,2′-bipyridine (1) was previously shown to be weakly fluorescent as a result of π→π* transitions. The other four ligands have properties consistent with an n→π* intraligand charge transfer excited state. Strongly donating amino and aminophenyl (2 and 4) substituents gave low quantum yields, while weaker donating benzimidazole substituents (6 and 7) gave high quantum yields. Absorption and fluorescence wavelengths underwent bathochromic shifts upon ZnII binding in a majority of cases. Quantum yields drastically increased upon ZnII binding for 1 and 2, but decreased for 4, 6, and 7. Compounds 6 and 7 were incubated with PC-3, DU 145 and BPH-1 cells to determine their ZnII sensing abilities in a biol. system. Weak fluorescence was observed in BPH-1 cells and subsequent incubation with ZnII caused fluorescence intensity to increase. No fluorescence was observed in PCa cell lines. Further study of these ligands may allow for quant. determination of ZnII concentrations in ex vivo tissue samples. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Recommanded Product: 75449-26-2

The Article related to bipyridine ligand fluorescent indicator zinc fluorescence imaging prostate cell, uv/vis spectroscopy, fluorescence spectroscopy, fluorescent probes, prostate cancer, zinc and other aspects.Recommanded Product: 75449-26-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wang, Yan-Qin; Tan, Qing-Hua; Liu, Hou-Ting; Wei, -Sun; Liu, Zhi-Liang published an article in 2015, the title of the article was A luminescent europium MOF containing Lewis basic pyridyl site for highly selective sensing of o-, m- and p-nitrophenol.Related Products of 1431292-15-7 And the article contains the following content:

A new luminescent two-dimensional Eu metal-organic framework [Eu6(L)3(HL)2(H2O)10]·10H2O·x(solvent) (1) was successfully prepared by the solvothermal reaction of Eu(NO3)3·6H2O and the multidentate π-conjugated ligand H4L [H4L = (5,5′-(pyridine-2,5-diyl)bis(isophthalic acid))] which has a Lewis basic pyridyl site. The solid sample of 1 emits high bright red light which can be readily observed by the naked eye when excited at 358 nm at ambient temperature The luminescence of finely ground 1 particles dispersed in EtOH can be sensitively and selectively quenched by adding trace amounts of o-, m- and p-nitrophenol (NP), which reveals that 1 can be used as a luminescence sensor for the detection of o-, m- and p-NP. The experimental process involved the reaction of 5,5′-(Pyridine-2,5-diyl)diisophthalic acid(cas: 1431292-15-7).Related Products of 1431292-15-7

The Article related to europium pyridinediylbisisophthalate mof solvothermal preparation crystal structure luminescence, nitrophenol luminescence sensor europium pyridinediylbisisophthalate mof and other aspects.Related Products of 1431292-15-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Funada, Atsushi; Uchikawa, Shota; Hoshino, Norihisa; Takeda, Takashi; Akutagawa, Tomoyuki published an article in 2016, the title of the article was Conformational Transformations of (C12H25NH3+)(Pyridinesulfonate) in the Solid State.Recommanded Product: Pyridine-3-sulfonic acid And the article contains the following content:

The phase-transition behaviors, crystal structures, and dielec. properties of four kinds of simple 1:1 organic salts of (C12H25NH3+)(benzenesulfonate) and (C12H25NH3+)(pyridine sulfonates) were examined from the viewpoint of intermol. hydrogen-bonding interactions and dynamic conformational transformation in mol. assemblies. Crystals of (C12H25NH3+)(benzenesulfonate) and (C12H25NH3+)(3-pyridinesulfonate) were isostructural and solid-solid and solid-liquid-crystal smectic A (SmA) phase transitions were observed These two crystals formed rodlike cation-anion assemblies. However, the two salts, (C12H25NH3+)(2-pyridinesulfonate) and (C12H25NH3+)(4-pyridinesulfonate), formed largely bent L-shaped cation-anion conformations. Interesting conformational transformations from rodlike to L-shaped assemblies were observed in (C12H25NH3+)(2-pyridinesulfonate) and (C12H25NH3+)(3-pyridinesulfonate). The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Recommanded Product: Pyridine-3-sulfonic acid

The Article related to conformational transformation laurylammonium pyridinesulfonate solid state, conformation analysis, dielectric properties, ionic crystals, liquid crystals, phase transitions and other aspects.Recommanded Product: Pyridine-3-sulfonic acid

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem