Category: pyridine-derivatives

Gragg, B. R. published the artcileA carbon-13 NMR study on some phenylborane derivatives, SDS of cas: 971-66-4, the publication is Journal of Organometallic Chemistry (1977), 132(1), 29-36, database is CAplus.

The intensity of 13C NMR signals of C atoms bonded to B can frequently be increased by recording the spectra at low temperatures Though this procedure results in a loss of fine structure, it enables the determination of chem. shift data for NMR signals that are either broad or unobservable at ambient temperature High temperature recording of spectra seems to be a useful technique for resolving multiplet resonance signals that are collapsed in ambient temperature spectra. 13C NMR data are reported for a variety of phenylborane derivatives; no simple correlation seems to exist between δ13C of the phenyl C atom bonded to B and δ11B of the phenylborane species.

Journal of Organometallic Chemistry published new progress about 971-66-4. 971-66-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is Triphenyl(pyridin-1-ium-1-yl)borate, and the molecular formula is C23H20BN, SDS of cas: 971-66-4.

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

Fenger, Isabelle published the artcileReusable polymer-supported palladium catalysts: an alternative to tetrakis(triphenylphosphine)palladium in the Suzuki cross-coupling reaction, Recommanded Product: 5-Nitro-2-phenylpyridine, the publication is Tetrahedron Letters (1998), 39(24), 4287-4290, database is CAplus.

The Suzuki cross-coupling reaction of a boronic acid and a bromoarom. compound requires palladium catalysis. Almost identical yields were obtained under the usual conditions, with 30 mequivalent of Pd(PPh₃)₄, and with 2 mequiv of a polymer-supported catalyst, which was easily prepared in two steps from Merrifield polymer. Recovery and reuse of the catalyst is easy, and only 0.60% of the initial amount of palladium is lost during a reaction.

Tetrahedron Letters published new progress about 89076-64-2. 89076-64-2 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitro Compound,Benzene, name is 5-Nitro-2-phenylpyridine, and the molecular formula is C11H8N2O2, Recommanded Product: 5-Nitro-2-phenylpyridine.

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

Kerric, Gaelle published the artcileUse of polymer-supported phenyltin for the creation of aryl-aryl or aryl-heteroaryl bonds via Stille cross-coupling reactions, Synthetic Route of 89076-64-2, the publication is Journal of Organometallic Chemistry (2009), 695(1), 103-110, database is CAplus.

An insoluble polymer-supported phenyltin reagent was successfully used in Stille cross-coupling reactions with aryl- and heteroaryl halides. Cross-coupling products were isolated in good to high yields with very low contamination by tin and palladium residues after removal of the residual supported organotin halide. The regeneration and recyclability of the supported phenyltin reagent were also examined and proved to be possible, but required palladium cleaning of the grafted polymer to be efficient along 4 cycles when Pd(PPh₃)₄ was used as catalyst.

Journal of Organometallic Chemistry published new progress about 89076-64-2. 89076-64-2 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitro Compound,Benzene, name is 5-Nitro-2-phenylpyridine, and the molecular formula is C11H8N2O2, Synthetic Route of 89076-64-2.

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

Cox, Paul A. published the artcileProtodeboronation of Heteroaromatic, Vinyl, and Cyclopropyl Boronic Acids: pH-Rate Profiles, Autocatalysis, and Disproportionation, Name: 2-Pyridinylboronic acid, the publication is Journal of the American Chemical Society (2016), 138(29), 9145-9157, database is CAplus and MEDLINE.

PH-rate profiles for aqueous-organic protodeboronation of 18 boronic acids, many widely viewed as unstable, have been studied by NMR and DFT. Rates were pH-dependent, and varied substantially between the boronic acids, with rate maxima that varied over 6 orders of magnitude. A mechanistic model containing five general pathways (k₁-k₅) has been developed, and together with input of [B]_tot, K_W, K_a, and K_aH, the protodeboronation kinetics can be correlated as a function of pH (1-13) for all 18 species. Cyclopropyl and vinyl boronic acids undergo very slow protodeboronation, as do 3- and 4-pyridyl boronic acids (t_0.5 > 1 wk, pH 12, 70 °C). In contrast, 2-pyridyl and 5-thiazolyl boronic acids undergo rapid protodeboronation (t_0.5 â‰?25-50 s, pH 7, 70 °C), via fragmentation of zwitterionic intermediates. Lewis acid additives (e.g., Cu, Zn salts) can attenuate (2-pyridyl) or accelerate (5-thiazolyl and 5-pyrazolyl) fragmentation. Two addnl. processes compete when the boronic acid and the boronate are present in sufficient proportions (pH = pK_a ± 1.6): (i) self-/autocatalysis and (ii) sequential disproportionations of boronic acid to borinic acid and borane.

Journal of the American Chemical Society published new progress about 197958-29-5. 197958-29-5 belongs to pyridine-derivatives, auxiliary class Pyridine,Boronic acid and ester, name is 2-Pyridinylboronic acid, and the molecular formula is C5H6BNO2, Name: 2-Pyridinylboronic acid.

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

Chesnokova, Alexandra N. published the artcileSynthesis and properties of composite membranes for polymer electrolyte membrane fuel cells, Application In Synthesis of 636-73-7, the publication is Advanced Materials Research (Durnten-Zurich, Switzerland) (2014), 251-256, database is CAplus.

The paper is devoted to the sol-gel synthesis of proton conductive organic-silicon composite membranes based on tetra-Et orthosilicate (TEOS) and copolymers of 2-methyl-5-vinylpyridine and vinyl chloride (MVP-VC), 2-methyl-5-vinylpyridine and vinyl acetate (MVP-VA), copolymers of ethylene glycol vinyl glycidyl ether and styrene (KS-1 and KS-2), and nitrogen-containing heteroaromatic derivatives of sulfonic acids: 2-phenyl-5-benzimidazolsulfonic acid (PBISA) and pyridine-3-sulfonic acid (PSA). Properties of synthesized membranes, such as proton conductivity, activation energy, ion exchange capacity, dimensional stability have been investigated.

Advanced Materials Research (Durnten-Zurich, Switzerland) 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, Application In Synthesis of 636-73-7.

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

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

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

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

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