Month: December 2022

Gomez Fernandez, Mario Andres published the artcileStudies on The Application of The Paterno-Buechi Reaction to The Synthesis of Novel Fluorinated Scaffolds, Quality Control of 91-02-1, the publication is Chemistry – A European Journal (2021), 27(63), 15722-15729, database is CAplus and MEDLINE.

In the context of new scaffolds obtained by photochem. reactions, Paterno-Buechi reactions between heteroaromatic, trifluoromethylphenyl ketone and electron rich alkenes to give oxetanes are described. A comprehensive study has been carried out on the reaction of aromatic ketones with fluorinated alkenes. Depending on the substitution pattern at the oxetane ring, a metathesis reaction is described as a minor side process to give mono-fluorinated alkenes. Overall, this last reaction corresponds to a photo-Wittig reaction and yields amide isosteres. In order to explain the uncommon regioselectivity of the Paterno-Buechi reaction with these alkenes, electrostatic-potential-derived charges (ESP) have been determined In a second computational study, the relative stabilities of the typical 1,4-diradical intermediates of the Paterno-Buechi reaction have been determined The results explain the regioselectivity. Further transformations of the oxetanes or previous functionalization of the fluoroalkenes open perspectives for oxetanes as core structures for biol. active compounds

Chemistry – A European Journal published new progress about 91-02-1. 91-02-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene,Ketone, name is Phenyl(pyridin-2-yl)methanone, and the molecular formula is C12H9NO, Quality Control of 91-02-1.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Reams, Steve G. published the artcileEffect of chelating agents and respiratory inhibitors on regulation of the cadA gene in Escherichia coli, Related Products of pyridine-derivatives, the publication is Archives of Microbiology (1997), 167(4), 209-216, database is CAplus and MEDLINE.

The cadA gene that encodes Lys decarboxylase in E. coli is induced by low pH and during anaerobic growth by Lys. Operon fusions of cadA to lacZ was used to investigate the effects of aeration on cadA regulation. When an insertion mutation in osmZ (= hns) was introduced, a cadA-lacZ fusion was derepressed in the presence of air to approx. the same level as seen during anaerobic growth. The pH-dependent regulation of cadA was not affected by osmZ. Introduction of mutations in rpoS, fur, or fnr had no effect on cadA expression. Defects in arcB or arcA largely abolished expression of cadA during anaerobic growth. Nonetheless, strains defective in both arcB and osmZ showed the same high cadA-lac expression in air as seen in the single osmZ derivatives Blocking the respiratory chain with mutations or chem. inhibitors also caused derepression of a cadA-lacZ fusion in air, while agents affecting the proton gradient had no effect. Derepression of cadA in air was also mediated by several chelating agents, in particular by methoxyindole carboxylic acid. Addition of Fe²⁺ overcame this effect. Chelating agents also abolished the expression during aerobic growth of several genes known to be under arcAB control and which are normally repressed during anaerobic growth but induced in the presence of air. This implies that the effect of chelating agents on cadA expression is mediated via the arcAB regulatory system.

Archives of Microbiology published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C5H5NO3S, Related Products of pyridine-derivatives.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Hoyt, Caroline B. published the artcileSelective C(sp³)-H Monoarylation Catalyzed by a Covalently Cross-Linked Reverse Micelle-Supported Palladium Catalyst, Name: 4-Amino-2-picoline, the publication is Advanced Synthesis & Catalysis (2017), 359(20), 3611-3617, database is CAplus.

In this work, we illustrate the performance of a solvated micelle-supported ligand as a platform for coordination with palladium for C-H arylation. The micelle-supported ligand is one of the first applications of a micelle-supported ligand for C-H arylation, and provides a tunable support for future elaboration. The use of a spatially constrained system promoted selectivity trends influenced by both the sterics and electronics of the system, differing from the homogeneous catalyst, with high yields and selectivities.

Advanced Synthesis & Catalysis published new progress about 18437-58-6. 18437-58-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 4-Amino-2-picoline, and the molecular formula is C6H8N2, Name: 4-Amino-2-picoline.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Seet, Ai-Mee published the artcileDetermination and properties of erythrocyte lipoyl dehydrogenase, SDS of cas: 2215-33-0, the publication is Mikrochimica Acta (1975), 2(4-5), 407-12, database is CAplus.

Erythrocyte lipoyl dehydrogenase activity was determined colorimetrically with Pd(II)-1,3-bis(2′-pyridyl)-1,2-diazaprop-2-ene. The properties of red cell enzyme were described and normal values for erythrocyte lipoyl dehydrogenase were given. The possible role of this enzyme in the erythrocytes was discussed.

Mikrochimica Acta published new progress about 2215-33-0. 2215-33-0 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, and the molecular formula is C9H5ClO4S, SDS of cas: 2215-33-0.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Seet, Ai-Mee published the artcileSpectrophotometric determination of palladium(II) using 1,3-bis(2′-pyridyl)-1,2-diazaprop-2-ene, Application of 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, the publication is Mikrochimica Acta (1974), 235-43, database is CAplus.

Pd was determined spectrophotometrically at 573 nm (molar absorptivity was 1.8 × 104) after complexation in 0.05N HCl with 1,3-bis-(2-pyridyl)-1,2-diaza-2-propene (I) and extraction of the complex into C6H6. Beer’s law was obeyed for â‰?00 μg Pd when the complex is extracted into 10 ml. C6H6. Complexes with 1:1 and 2:1 Pd-I mole ratios were formed. For determinations of 10-80 μg Pd, relative standard deviations were 1.99-4.64%.

Mikrochimica Acta published new progress about 2215-33-0. 2215-33-0 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, and the molecular formula is C9H5ClO4S, Application of 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Bockman, T. M. published the artcileTime-resolved spectroscopy and charge-transfer photochemistry of aromatic EDA complexes with X-pyridinium cations, COA of Formula: C6H5F4NO3S, the publication is Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999) (1992), 1581-94, database is CAplus.

Direct photoexcitation of 1:1 aromatic EDA complexes with various N-substituted X-pyridinium cations (X = nitro, fluoro, methoxy and acetoxy) is achieved by the specific irradiation of their charge-transfer (CT) absorption bands. Time-resolved picosecond spectroscopy refers to charge-transfer activation by the identification of the aromatic cation radical as the initial transient (T₁) formed in a photoinduced electron-transfer together with the X-pyridinyl radical. The homolytic fragmentation of the latter varies with the X-substituent in the order X = NO₂ > F > AcO > CH₃O, and the addition of X^{â€?/sup> to the aromatic donors leads to a series of cyclohexadienyl adducts that are identified as longer-lived transients (T₂) by time-resolved (nanosecond/μs) spectroscopy. The phototransients T₁ and T₂ together account for the different types of aromatic product (resulting from ring substitution, side-chain substitution and dimerization) that are generated by steady-state CT photochem. of the aromatic EDA complexes with X-pyridinium cations.}

Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999) published new progress about 107263-95-6. 107263-95-6 belongs to pyridine-derivatives, auxiliary class Fluorination reagent, name is 1-Fluoropyridiniumtriflate, and the molecular formula is C6H5F4NO3S, COA of Formula: C6H5F4NO3S.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Im, Yirang published the artcileEffect of nitrogen position of carboline on the device performances of blue phosphorescent organic light-emitting diodes, Synthetic Route of 39856-58-1, the publication is Synthetic Metals (2015), 24-28, database is CAplus.

A δ-carboline derived compound, 5-(3′-(9-carbazolyl)[1,1′-biphenyl]-3-yl)pyrido[3,2-b]indole, was synthesized as a high triplet energy bipolar host material for blue phosphorescent organic light-emitting diodes and it was compared with α-carboline derived host material with the same backbone structure. The δ-carboline derived host material showed better electron transport properties than the host with α-carboline due to better electron accepting properties. Therefore, the new host material reduced driving voltage and increased the power efficiency of blue phosphorescent organic light-emitting diodes compared to a standard host with α-carboline moiety. A high external quantum efficiency of 25.3% and a high power efficiency of 36.4 lm/W were achieved in the blue phosphorescent organic light-emitting diodes.

Synthetic Metals published new progress about 39856-58-1. 39856-58-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Bromide,Amine, name is 2-Bromopyridin-3-amine, and the molecular formula is C5H5BrN2, Synthetic Route of 39856-58-1.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Park, Kwanghee Koh published the artcileSynthesis and proton-NMR of N-arylated nitrogen-containing aromatic heterocycles, Application In Synthesis of 47369-00-6, the publication is Bulletin of the Korean Chemical Society (1985), 6(3), 141-4, database is CAplus.

Pyridinium derivatives I and II (R = H, p-Me, p-Et, p-Cl, p-cyano, p-MeO, p-HO; R¹ = H, H₂NCO) were prepared by treating 4,4′-bipyridine, pyridine, and nicotinamide with 2,4-(O₂N)₂C₆H₃Cl to give the phenylpyridinium derivatives which were they treated with RC₆H₄NH₂.

Bulletin of the Korean Chemical Society published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, Application In Synthesis of 47369-00-6.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Yoon, Sung Joon published the artcileA study on the effect of a pyridine secondary acceptor on the emission properties of thermally activated delayed fluorescence emitters, Name: 2-Chloro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3-(trifluoromethyl)pyridine, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2020), 8(22), 7485-7491, database is CAplus.

A new mol. design of thermally activated delayed fluorescence (TADF) emitters having a pyridine derived secondary acceptor was developed. Four TADF emitters were designed and synthesized to study the effect of the pyridine derived secondary acceptor on their TADF properties and device performances were studied. The 4 TADF emitters, HPy, CNPy, CF3Py and CH3Py, with a pyridine secondary acceptor decorated by functional groups were developed as an approach to manage the emission wavelength and to improve efficiency roll-off characteristics of green TADF organic light-emitting diodes by decreasing the delayed fluorescence lifetime. The pyridine secondary acceptor based TADF emitters showed short delayed fluorescence lifetimes, and the TADF emitter with the Me group functionalized pyridine secondary acceptor achieved a high external quantum efficiency (EQE) of >20% and little efficiency roll-off �000 cd m^-2. Therefore, the pyridine secondary acceptor based mol. design was effective to manage the delayed fluorescence lifetime of the TADF emitters, and external quantum efficiency and efficiency roll-off of the TADF devices.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about 741709-67-1. 741709-67-1 belongs to pyridine-derivatives, auxiliary class Trifluoromethyl,Pyridine,Fluoride,Chloride,Boronic acid and ester,Boronate Esters,Boronic Acids,Boronic acid and ester, name is 2-Chloro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3-(trifluoromethyl)pyridine, and the molecular formula is C8H11BO3, Name: 2-Chloro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3-(trifluoromethyl)pyridine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Wang, Ren-Tzong published the artcileAnion-induced ionic liquid crystals of diphenylviologens, SDS of cas: 47369-00-6, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2018), 6(35), 9430-9444, database is CAplus.

Two series of ionic liquid crystals derived from diphenylviologens, I and II, were prepared and their photophys. and electrochem. properties were also investigated. The crystallog. data of two single crystals, I (R = C_nH_2n+1, n = 10) and II-BF₄ (R = C_nH_2n+1, n = 12), showed that a mono- or bilayer-lamellar structure was induced by intermol. H-bonds. All mesophases were identified as smectic A phases by POM textures and powder XRD data. A linear correlation plot (R² = 0.8885) of the d-spacings vs. the calculated effective radius (R_eff) in compounds II was obtained. The aggregation-induced emission (AIE) ranging from ca. 463 to 529 nm observed in compounds II (e.g., X = BF₄, PF₆, RSO₃, OTf and NTf₂) was also anion dependent. Also, compounds II exhibited thermal switching, with an On/Off-emission mode between the Cr and SmA phases. In its cyclic voltammogram, compound I-RSO₃ (R = C_nH_2n+1, n = 12) exhibited two distinct reversible redox couples; in contrast, compound II-RSO₃ (R = C_nH_2n+1, n = 12) formed spike-like voltammetric peak potentials without redox couples.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C10H16Br3N, SDS of cas: 47369-00-6.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem